diff --git a/src/applications/calendar/controller/PhabricatorCalendarEventExportController.php b/src/applications/calendar/controller/PhabricatorCalendarEventExportController.php
index e09237d627..e96744e46a 100644
--- a/src/applications/calendar/controller/PhabricatorCalendarEventExportController.php
+++ b/src/applications/calendar/controller/PhabricatorCalendarEventExportController.php
@@ -1,54 +1,54 @@
 <?php
 
 final class PhabricatorCalendarEventExportController
   extends PhabricatorCalendarController {
 
   public function shouldAllowPublic() {
     return true;
   }
 
   public function handleRequest(AphrontRequest $request) {
     $viewer = $this->getViewer();
     $id = $request->getURIData('id');
 
     $event = id(new PhabricatorCalendarEventQuery())
       ->setViewer($viewer)
       ->withIDs(array($id))
       ->executeOne();
     if (!$event) {
       return new Aphront404Response();
     }
 
     if ($request->isFormPost()) {
       $file_name = $event->getMonogram().'.ics';
 
-      $event_node = $event->newIntermediateEventNode();
+      $event_node = $event->newIntermediateEventNode($viewer);
 
       $document_node = id(new PhutilCalendarDocumentNode())
         ->appendChild($event_node);
 
       $root_node = id(new PhutilCalendarRootNode())
         ->appendChild($document_node);
 
       $ics_data = id(new PhutilICSWriter())
         ->writeICSDocument($root_node);
 
       return id(new AphrontFileResponse())
         ->setDownload($file_name)
         ->setMimeType('text/calendar')
         ->setContent($ics_data);
     }
 
     return $this->newDialog()
       ->setDisableWorkflowOnSubmit(true)
       ->setTitle(pht('Export as .ics'))
       ->appendParagraph(
         pht(
           'WARNING: This feature is a prototype and only supports a limited '.
           'set of features. Keep your expectations low!'))
       ->addSubmitButton(pht('Download .ics'))
       ->addCancelButton($event->getURI(), pht('Close'));
 
   }
 
 }
diff --git a/src/applications/calendar/storage/PhabricatorCalendarEvent.php b/src/applications/calendar/storage/PhabricatorCalendarEvent.php
index 93ca779794..f3865583e2 100644
--- a/src/applications/calendar/storage/PhabricatorCalendarEvent.php
+++ b/src/applications/calendar/storage/PhabricatorCalendarEvent.php
@@ -1,851 +1,906 @@
 <?php
 
 final class PhabricatorCalendarEvent extends PhabricatorCalendarDAO
   implements
     PhabricatorPolicyInterface,
     PhabricatorProjectInterface,
     PhabricatorMarkupInterface,
     PhabricatorApplicationTransactionInterface,
     PhabricatorSubscribableInterface,
     PhabricatorTokenReceiverInterface,
     PhabricatorDestructibleInterface,
     PhabricatorMentionableInterface,
     PhabricatorFlaggableInterface,
     PhabricatorSpacesInterface,
     PhabricatorFulltextInterface,
     PhabricatorConduitResultInterface {
 
   protected $name;
   protected $hostPHID;
   protected $dateFrom;
   protected $dateTo;
   protected $allDayDateFrom;
   protected $allDayDateTo;
   protected $description;
   protected $isCancelled;
   protected $isAllDay;
   protected $icon;
   protected $mailKey;
   protected $isStub;
 
   protected $isRecurring = 0;
   protected $recurrenceFrequency = array();
   protected $recurrenceEndDate;
 
   private $isGhostEvent = false;
   protected $instanceOfEventPHID;
   protected $sequenceIndex;
 
   protected $viewPolicy;
   protected $editPolicy;
 
   protected $spacePHID;
 
   private $parentEvent = self::ATTACHABLE;
   private $invitees = self::ATTACHABLE;
 
   private $viewerDateFrom;
   private $viewerDateTo;
 
   // Frequency Constants
   const FREQUENCY_DAILY = 'daily';
   const FREQUENCY_WEEKLY = 'weekly';
   const FREQUENCY_MONTHLY = 'monthly';
   const FREQUENCY_YEARLY = 'yearly';
 
   public static function initializeNewCalendarEvent(PhabricatorUser $actor) {
     $app = id(new PhabricatorApplicationQuery())
       ->setViewer($actor)
       ->withClasses(array('PhabricatorCalendarApplication'))
       ->executeOne();
 
     $view_default = PhabricatorCalendarEventDefaultViewCapability::CAPABILITY;
     $edit_default = PhabricatorCalendarEventDefaultEditCapability::CAPABILITY;
     $view_policy = $app->getPolicy($view_default);
     $edit_policy = $app->getPolicy($edit_default);
 
     $now = PhabricatorTime::getNow();
 
     $start = new DateTime('@'.$now);
     $start->setTimeZone($actor->getTimeZone());
 
     $start->setTime($start->format('H'), 0, 0);
     $start->modify('+1 hour');
     $end = id(clone $start)->modify('+1 hour');
 
     $epoch_min = $start->format('U');
     $epoch_max = $end->format('U');
 
     $now_date = new DateTime('@'.$now);
     $now_min = id(clone $now_date)->setTime(0, 0)->format('U');
     $now_max = id(clone $now_date)->setTime(23, 59)->format('U');
 
     $default_icon = 'fa-calendar';
 
     return id(new PhabricatorCalendarEvent())
       ->setHostPHID($actor->getPHID())
       ->setIsCancelled(0)
       ->setIsAllDay(0)
       ->setIsStub(0)
       ->setIsRecurring(0)
       ->setRecurrenceFrequency(
         array(
           'rule' => self::FREQUENCY_WEEKLY,
         ))
       ->setIcon($default_icon)
       ->setViewPolicy($view_policy)
       ->setEditPolicy($edit_policy)
       ->setSpacePHID($actor->getDefaultSpacePHID())
       ->attachInvitees(array())
       ->setDateFrom($epoch_min)
       ->setDateTo($epoch_max)
       ->setAllDayDateFrom($now_min)
       ->setAllDayDateTo($now_max)
       ->applyViewerTimezone($actor);
   }
 
   private function newChild(PhabricatorUser $actor, $sequence) {
     if (!$this->isParentEvent()) {
       throw new Exception(
         pht(
           'Unable to generate a new child event for an event which is not '.
           'a recurring parent event!'));
     }
 
     $child = id(new self())
       ->setIsCancelled(0)
       ->setIsStub(0)
       ->setInstanceOfEventPHID($this->getPHID())
       ->setSequenceIndex($sequence)
       ->setIsRecurring(true)
       ->setRecurrenceFrequency($this->getRecurrenceFrequency())
       ->attachParentEvent($this);
 
     return $child->copyFromParent($actor);
   }
 
   protected function readField($field) {
     static $inherit = array(
       'hostPHID' => true,
       'isAllDay' => true,
       'icon' => true,
       'spacePHID' => true,
       'viewPolicy' => true,
       'editPolicy' => true,
       'name' => true,
       'description' => true,
     );
 
     // Read these fields from the parent event instead of this event. For
     // example, we want any changes to the parent event's name to apply to
     // the child.
     if (isset($inherit[$field])) {
       if ($this->getIsStub()) {
         // TODO: This should be unconditional, but the execution order of
         // CalendarEventQuery and applyViewerTimezone() are currently odd.
         if ($this->parentEvent !== self::ATTACHABLE) {
           return $this->getParentEvent()->readField($field);
         }
       }
     }
 
     return parent::readField($field);
   }
 
 
   public function copyFromParent(PhabricatorUser $actor) {
     if (!$this->isChildEvent()) {
       throw new Exception(
         pht(
           'Unable to copy from parent event: this is not a child event.'));
     }
 
     $parent = $this->getParentEvent();
 
     $this
       ->setHostPHID($parent->getHostPHID())
       ->setIsAllDay($parent->getIsAllDay())
       ->setIcon($parent->getIcon())
       ->setSpacePHID($parent->getSpacePHID())
       ->setViewPolicy($parent->getViewPolicy())
       ->setEditPolicy($parent->getEditPolicy())
       ->setName($parent->getName())
       ->setDescription($parent->getDescription());
 
     $sequence = $this->getSequenceIndex();
     $duration = $this->getDuration();
     $epochs = $parent->getSequenceIndexEpochs($actor, $sequence, $duration);
 
     $this
       ->setDateFrom($epochs['dateFrom'])
       ->setDateTo($epochs['dateTo'])
       ->setAllDayDateFrom($epochs['allDayDateFrom'])
       ->setAllDayDateTo($epochs['allDayDateTo']);
 
     return $this;
   }
 
   public function isValidSequenceIndex(PhabricatorUser $viewer, $sequence) {
     try {
       $this->getSequenceIndexEpochs($viewer, $sequence, $this->getDuration());
       return true;
     } catch (Exception $ex) {
       return false;
     }
   }
 
   private function getSequenceIndexEpochs(
     PhabricatorUser $viewer,
     $sequence,
     $duration) {
 
     $frequency = $this->getFrequencyUnit();
     $modify_key = '+'.$sequence.' '.$frequency;
 
     $date = $this->getDateFrom();
     $date_time = PhabricatorTime::getDateTimeFromEpoch($date, $viewer);
     $date_time->modify($modify_key);
     $date = $date_time->format('U');
 
     $end_date = $this->getRecurrenceEndDate();
     if ($end_date && $date > $end_date) {
       throw new Exception(
         pht(
           'Sequence "%s" is invalid for this event: it would occur after '.
           'the event stops repeating.',
           $sequence));
     }
 
     $utc = new DateTimeZone('UTC');
 
     $allday_from = $this->getAllDayDateFrom();
     $allday_date = new DateTime('@'.$allday_from, $utc);
     $allday_date->setTimeZone($utc);
     $allday_date->modify($modify_key);
 
     $allday_min = $allday_date->format('U');
     $allday_duration = ($this->getAllDayDateTo() - $allday_from);
 
     return array(
       'dateFrom' => $date,
       'dateTo' => $date + $duration,
       'allDayDateFrom' => $allday_min,
       'allDayDateTo' => $allday_min + $allday_duration,
     );
   }
 
   public function newStub(PhabricatorUser $actor, $sequence) {
     $stub = $this->newChild($actor, $sequence);
 
     $stub->setIsStub(1);
 
     $unguarded = AphrontWriteGuard::beginScopedUnguardedWrites();
       $stub->save();
     unset($unguarded);
 
     $stub->applyViewerTimezone($actor);
 
     return $stub;
   }
 
   public function newGhost(PhabricatorUser $actor, $sequence) {
     $ghost = $this->newChild($actor, $sequence);
 
     $ghost
       ->setIsGhostEvent(true)
       ->makeEphemeral();
 
     $ghost->applyViewerTimezone($actor);
 
     return $ghost;
   }
 
   public function getViewerDateFrom() {
     if ($this->viewerDateFrom === null) {
       throw new PhutilInvalidStateException('applyViewerTimezone');
     }
 
     return $this->viewerDateFrom;
   }
 
   public function getViewerDateTo() {
     if ($this->viewerDateTo === null) {
       throw new PhutilInvalidStateException('applyViewerTimezone');
     }
 
     return $this->viewerDateTo;
   }
 
   public function applyViewerTimezone(PhabricatorUser $viewer) {
     if (!$this->getIsAllDay()) {
       $this->viewerDateFrom = $this->getDateFrom();
       $this->viewerDateTo = $this->getDateTo();
     } else {
       $zone = $viewer->getTimeZone();
 
       $this->viewerDateFrom = $this->getDateEpochForTimezone(
         $this->getAllDayDateFrom(),
         new DateTimeZone('UTC'),
         'Y-m-d',
         null,
         $zone);
 
       $this->viewerDateTo = $this->getDateEpochForTimezone(
         $this->getAllDayDateTo(),
         new DateTimeZone('UTC'),
         'Y-m-d 23:59:00',
         null,
         $zone);
     }
 
     return $this;
   }
 
   public function getDuration() {
     return $this->getDateTo() - $this->getDateFrom();
   }
 
   public function getDateEpochForTimezone(
     $epoch,
     $src_zone,
     $format,
     $adjust,
     $dst_zone) {
 
     $src = new DateTime('@'.$epoch);
     $src->setTimeZone($src_zone);
 
     if (strlen($adjust)) {
       $adjust = ' '.$adjust;
     }
 
     $dst = new DateTime($src->format($format).$adjust, $dst_zone);
     return $dst->format('U');
   }
 
   public function save() {
     if (!$this->mailKey) {
       $this->mailKey = Filesystem::readRandomCharacters(20);
     }
 
     return parent::save();
   }
 
   /**
    * Get the event start epoch for evaluating invitee availability.
    *
    * When assessing availability, we pretend events start earlier than they
    * really do. This allows us to mark users away for the entire duration of a
    * series of back-to-back meetings, even if they don't strictly overlap.
    *
    * @return int Event start date for availability caches.
    */
   public function getDateFromForCache() {
     return ($this->getViewerDateFrom() - phutil_units('15 minutes in seconds'));
   }
 
   protected function getConfiguration() {
     return array(
       self::CONFIG_AUX_PHID => true,
       self::CONFIG_COLUMN_SCHEMA => array(
         'name' => 'text',
         'dateFrom' => 'epoch',
         'dateTo' => 'epoch',
         'allDayDateFrom' => 'epoch',
         'allDayDateTo' => 'epoch',
         'description' => 'text',
         'isCancelled' => 'bool',
         'isAllDay' => 'bool',
         'icon' => 'text32',
         'mailKey' => 'bytes20',
         'isRecurring' => 'bool',
         'recurrenceEndDate' => 'epoch?',
         'instanceOfEventPHID' => 'phid?',
         'sequenceIndex' => 'uint32?',
         'isStub' => 'bool',
       ),
       self::CONFIG_KEY_SCHEMA => array(
         'key_date' => array(
           'columns' => array('dateFrom', 'dateTo'),
         ),
         'key_instance' => array(
           'columns' => array('instanceOfEventPHID', 'sequenceIndex'),
           'unique' => true,
         ),
       ),
       self::CONFIG_SERIALIZATION => array(
         'recurrenceFrequency' => self::SERIALIZATION_JSON,
       ),
     ) + parent::getConfiguration();
   }
 
   public function generatePHID() {
     return PhabricatorPHID::generateNewPHID(
       PhabricatorCalendarEventPHIDType::TYPECONST);
   }
 
   public function getMonogram() {
     return 'E'.$this->getID();
   }
 
   public function getInvitees() {
     return $this->assertAttached($this->invitees);
   }
 
   public function attachInvitees(array $invitees) {
     $this->invitees = $invitees;
     return $this;
   }
 
   public function getInviteePHIDsForEdit() {
     $invitees = array();
 
     foreach ($this->getInvitees() as $invitee) {
       if ($invitee->isUninvited()) {
         continue;
       }
       $invitees[] = $invitee->getInviteePHID();
     }
 
     return $invitees;
   }
 
   public function getUserInviteStatus($phid) {
     $invitees = $this->getInvitees();
     $invitees = mpull($invitees, null, 'getInviteePHID');
 
     $invited = idx($invitees, $phid);
     if (!$invited) {
       return PhabricatorCalendarEventInvitee::STATUS_UNINVITED;
     }
     $invited = $invited->getStatus();
     return $invited;
   }
 
   public function getIsUserAttending($phid) {
     $attending_status = PhabricatorCalendarEventInvitee::STATUS_ATTENDING;
 
     $old_status = $this->getUserInviteStatus($phid);
     $is_attending = ($old_status == $attending_status);
 
     return $is_attending;
   }
 
   public function getIsUserInvited($phid) {
     $uninvited_status = PhabricatorCalendarEventInvitee::STATUS_UNINVITED;
     $declined_status = PhabricatorCalendarEventInvitee::STATUS_DECLINED;
     $status = $this->getUserInviteStatus($phid);
     if ($status == $uninvited_status || $status == $declined_status) {
       return false;
     }
     return true;
   }
 
   public function getIsGhostEvent() {
     return $this->isGhostEvent;
   }
 
   public function setIsGhostEvent($is_ghost_event) {
     $this->isGhostEvent = $is_ghost_event;
     return $this;
   }
 
   public function getFrequencyRule() {
     return idx($this->recurrenceFrequency, 'rule');
   }
 
   public function getFrequencyUnit() {
     $frequency = $this->getFrequencyRule();
 
     switch ($frequency) {
       case 'daily':
         return 'day';
       case 'weekly':
         return 'week';
       case 'monthly':
         return 'month';
       case 'yearly':
         return 'year';
       default:
         return 'day';
     }
   }
 
   public function getURI() {
     if ($this->getIsGhostEvent()) {
       $base = $this->getParentEvent()->getURI();
       $sequence = $this->getSequenceIndex();
       return "{$base}/{$sequence}/";
     }
 
     return '/'.$this->getMonogram();
   }
 
   public function getParentEvent() {
     return $this->assertAttached($this->parentEvent);
   }
 
   public function attachParentEvent($event) {
     $this->parentEvent = $event;
     return $this;
   }
 
   public function isParentEvent() {
     return ($this->getIsRecurring() && !$this->getInstanceOfEventPHID());
   }
 
   public function isChildEvent() {
     return ($this->instanceOfEventPHID !== null);
   }
 
   public function isCancelledEvent() {
     if ($this->getIsCancelled()) {
       return true;
     }
 
     if ($this->isChildEvent()) {
       if ($this->getParentEvent()->getIsCancelled()) {
         return true;
       }
     }
 
     return false;
   }
 
   public function renderEventDate(
     PhabricatorUser $viewer,
     $show_end) {
 
     if ($show_end) {
       $min_date = PhabricatorTime::getDateTimeFromEpoch(
         $this->getViewerDateFrom(),
         $viewer);
 
       $max_date = PhabricatorTime::getDateTimeFromEpoch(
         $this->getViewerDateTo(),
         $viewer);
 
       $min_day = $min_date->format('Y m d');
       $max_day = $max_date->format('Y m d');
 
       $show_end_date = ($min_day != $max_day);
     } else {
       $show_end_date = false;
     }
 
     $min_epoch = $this->getViewerDateFrom();
     $max_epoch = $this->getViewerDateTo();
 
     if ($this->getIsAllDay()) {
       if ($show_end_date) {
         return pht(
           '%s - %s, All Day',
           phabricator_date($min_epoch, $viewer),
           phabricator_date($max_epoch, $viewer));
       } else {
         return pht(
           '%s, All Day',
           phabricator_date($min_epoch, $viewer));
       }
     } else if ($show_end_date) {
       return pht(
         '%s - %s',
         phabricator_datetime($min_epoch, $viewer),
         phabricator_datetime($max_epoch, $viewer));
     } else if ($show_end) {
       return pht(
         '%s - %s',
         phabricator_datetime($min_epoch, $viewer),
         phabricator_time($max_epoch, $viewer));
     } else {
       return pht(
         '%s',
         phabricator_datetime($min_epoch, $viewer));
     }
   }
 
 
   public function getDisplayIcon(PhabricatorUser $viewer) {
     if ($this->isCancelledEvent()) {
       return 'fa-times';
     }
 
     if ($viewer->isLoggedIn()) {
       $status = $this->getUserInviteStatus($viewer->getPHID());
       switch ($status) {
         case PhabricatorCalendarEventInvitee::STATUS_ATTENDING:
           return 'fa-check-circle';
         case PhabricatorCalendarEventInvitee::STATUS_INVITED:
           return 'fa-user-plus';
         case PhabricatorCalendarEventInvitee::STATUS_DECLINED:
           return 'fa-times';
       }
     }
 
     return $this->getIcon();
   }
 
   public function getDisplayIconColor(PhabricatorUser $viewer) {
     if ($this->isCancelledEvent()) {
       return 'red';
     }
 
     if ($viewer->isLoggedIn()) {
       $status = $this->getUserInviteStatus($viewer->getPHID());
       switch ($status) {
         case PhabricatorCalendarEventInvitee::STATUS_ATTENDING:
           return 'green';
         case PhabricatorCalendarEventInvitee::STATUS_INVITED:
           return 'green';
         case PhabricatorCalendarEventInvitee::STATUS_DECLINED:
           return 'grey';
       }
     }
 
     return 'bluegrey';
   }
 
   public function getDisplayIconLabel(PhabricatorUser $viewer) {
     if ($this->isCancelledEvent()) {
       return pht('Cancelled');
     }
 
     if ($viewer->isLoggedIn()) {
       $status = $this->getUserInviteStatus($viewer->getPHID());
       switch ($status) {
         case PhabricatorCalendarEventInvitee::STATUS_ATTENDING:
           return pht('Attending');
         case PhabricatorCalendarEventInvitee::STATUS_INVITED:
           return pht('Invited');
         case PhabricatorCalendarEventInvitee::STATUS_DECLINED:
           return pht('Declined');
       }
     }
 
     return null;
   }
 
 
-  public function newIntermediateEventNode() {
+  public function newIntermediateEventNode(PhabricatorUser $viewer) {
     $base_uri = new PhutilURI(PhabricatorEnv::getProductionURI('/'));
     $domain = $base_uri->getDomain();
 
     $uid = $this->getPHID().'@'.$domain;
 
     $created = $this->getDateCreated();
     $created = PhutilCalendarAbsoluteDateTime::newFromEpoch($created);
 
     $modified = $this->getDateModified();
     $modified = PhutilCalendarAbsoluteDateTime::newFromEpoch($modified);
 
     $date_start = $this->getDateFrom();
     $date_start = PhutilCalendarAbsoluteDateTime::newFromEpoch($date_start);
 
     $date_end = $this->getDateTo();
     $date_end = PhutilCalendarAbsoluteDateTime::newFromEpoch($date_end);
 
     if ($this->getIsAllDay()) {
       $date_start->setIsAllDay(true);
       $date_end->setIsAllDay(true);
     }
 
+    $host_phid = $this->getHostPHID();
+
+    $invitees = $this->getInvitees();
+    foreach ($invitees as $key => $invitee) {
+      if ($invitee->isUninvited()) {
+        unset($invitees[$key]);
+      }
+    }
+
+    $phids = array();
+    $phids[] = $host_phid;
+    foreach ($invitees as $invitee) {
+      $phids[] = $invitee->getInviteePHID();
+    }
+
+    $handles = $viewer->loadHandles($phids);
+
+    $host_handle = $handles[$host_phid];
+    $host_name = $host_handle->getFullName();
+    $host_uri = $host_handle->getURI();
+    $host_uri = PhabricatorEnv::getURI($host_uri);
+
+    $organizer = id(new PhutilCalendarUserNode())
+      ->setName($host_name)
+      ->setURI($host_uri);
+
+    $attendees = array();
+    foreach ($invitees as $invitee) {
+      $invitee_phid = $invitee->getInviteePHID();
+      $invitee_handle = $handles[$invitee_phid];
+      $invitee_name = $invitee_handle->getFullName();
+      $invitee_uri = $invitee_handle->getURI();
+      $invitee_uri = PhabricatorEnv::getURI($invitee_uri);
+
+      switch ($invitee->getStatus()) {
+        case PhabricatorCalendarEventInvitee::STATUS_ATTENDING:
+          $status = PhutilCalendarUserNode::STATUS_ACCEPTED;
+          break;
+        case PhabricatorCalendarEventInvitee::STATUS_DECLINED:
+          $status = PhutilCalendarUserNode::STATUS_DECLINED;
+          break;
+        case PhabricatorCalendarEventInvitee::STATUS_INVITED:
+        default:
+          $status = PhutilCalendarUserNode::STATUS_INVITED;
+          break;
+      }
+
+      $attendees[] = id(new PhutilCalendarUserNode())
+        ->setName($invitee_name)
+        ->setURI($invitee_uri)
+        ->setStatus($status);
+    }
+
     $node = id(new PhutilCalendarEventNode())
       ->setUID($uid)
       ->setName($this->getName())
       ->setDescription($this->getDescription())
       ->setCreatedDateTime($created)
       ->setModifiedDateTime($modified)
       ->setStartDateTime($date_start)
-      ->setEndDateTime($date_end);
+      ->setEndDateTime($date_end)
+      ->setOrganizer($organizer)
+      ->setAttendees($attendees);
 
     return $node;
   }
 
 
 
 /* -(  Markup Interface  )--------------------------------------------------- */
 
 
   /**
    * @task markup
    */
   public function getMarkupFieldKey($field) {
     $hash = PhabricatorHash::digest($this->getMarkupText($field));
     $id = $this->getID();
     return "calendar:T{$id}:{$field}:{$hash}";
   }
 
 
   /**
    * @task markup
    */
   public function getMarkupText($field) {
     return $this->getDescription();
   }
 
 
   /**
    * @task markup
    */
   public function newMarkupEngine($field) {
     return PhabricatorMarkupEngine::newCalendarMarkupEngine();
   }
 
 
   /**
    * @task markup
    */
   public function didMarkupText(
     $field,
     $output,
     PhutilMarkupEngine $engine) {
     return $output;
   }
 
 
   /**
    * @task markup
    */
   public function shouldUseMarkupCache($field) {
     return (bool)$this->getID();
   }
 
 /* -(  PhabricatorPolicyInterface  )----------------------------------------- */
 
 
   public function getCapabilities() {
     return array(
       PhabricatorPolicyCapability::CAN_VIEW,
       PhabricatorPolicyCapability::CAN_EDIT,
     );
   }
 
   public function getPolicy($capability) {
     switch ($capability) {
       case PhabricatorPolicyCapability::CAN_VIEW:
         return $this->getViewPolicy();
       case PhabricatorPolicyCapability::CAN_EDIT:
         return $this->getEditPolicy();
     }
   }
 
   public function hasAutomaticCapability($capability, PhabricatorUser $viewer) {
     // The host of an event can always view and edit it.
     $user_phid = $this->getHostPHID();
     if ($user_phid) {
       $viewer_phid = $viewer->getPHID();
       if ($viewer_phid == $user_phid) {
         return true;
       }
     }
 
     if ($capability == PhabricatorPolicyCapability::CAN_VIEW) {
       $status = $this->getUserInviteStatus($viewer->getPHID());
       if ($status == PhabricatorCalendarEventInvitee::STATUS_INVITED ||
         $status == PhabricatorCalendarEventInvitee::STATUS_ATTENDING ||
         $status == PhabricatorCalendarEventInvitee::STATUS_DECLINED) {
         return true;
       }
     }
 
     return false;
   }
 
   public function describeAutomaticCapability($capability) {
     return pht(
       'The host of an event can always view and edit it. Users who are '.
       'invited to an event can always view it.');
   }
 
 
 /* -(  PhabricatorApplicationTransactionInterface  )------------------------- */
 
 
   public function getApplicationTransactionEditor() {
     return new PhabricatorCalendarEventEditor();
   }
 
   public function getApplicationTransactionObject() {
     return $this;
   }
 
   public function getApplicationTransactionTemplate() {
     return new PhabricatorCalendarEventTransaction();
   }
 
   public function willRenderTimeline(
     PhabricatorApplicationTransactionView $timeline,
     AphrontRequest $request) {
 
     return $timeline;
   }
 
 /* -(  PhabricatorSubscribableInterface  )----------------------------------- */
 
 
   public function isAutomaticallySubscribed($phid) {
     return ($phid == $this->getHostPHID());
   }
 
 /* -(  PhabricatorTokenReceiverInterface  )---------------------------------- */
 
 
   public function getUsersToNotifyOfTokenGiven() {
     return array($this->getHostPHID());
   }
 
 /* -(  PhabricatorDestructibleInterface  )----------------------------------- */
 
 
   public function destroyObjectPermanently(
     PhabricatorDestructionEngine $engine) {
 
     $this->openTransaction();
     $this->delete();
     $this->saveTransaction();
   }
 
 /* -(  PhabricatorSpacesInterface  )----------------------------------------- */
 
 
   public function getSpacePHID() {
     return $this->spacePHID;
   }
 
 
 /* -(  PhabricatorFulltextInterface  )--------------------------------------- */
 
 
   public function newFulltextEngine() {
     return new PhabricatorCalendarEventFulltextEngine();
   }
 
 
 /* -(  PhabricatorConduitResultInterface  )---------------------------------- */
 
 
   public function getFieldSpecificationsForConduit() {
     return array(
       id(new PhabricatorConduitSearchFieldSpecification())
         ->setKey('name')
         ->setType('string')
         ->setDescription(pht('The name of the event.')),
       id(new PhabricatorConduitSearchFieldSpecification())
         ->setKey('description')
         ->setType('string')
         ->setDescription(pht('The event description.')),
     );
   }
 
   public function getFieldValuesForConduit() {
     return array(
       'name' => $this->getName(),
       'description' => $this->getDescription(),
     );
   }
 
   public function getConduitSearchAttachments() {
     return array();
   }
 
 }