diff --git a/src/applications/calendar/query/PhabricatorCalendarEventQuery.php b/src/applications/calendar/query/PhabricatorCalendarEventQuery.php
index 06416e43a1..51cd0ea25e 100644
--- a/src/applications/calendar/query/PhabricatorCalendarEventQuery.php
+++ b/src/applications/calendar/query/PhabricatorCalendarEventQuery.php
@@ -1,433 +1,435 @@
 <?php
 
 final class PhabricatorCalendarEventQuery
   extends PhabricatorCursorPagedPolicyAwareQuery {
 
   private $ids;
   private $phids;
   private $rangeBegin;
   private $rangeEnd;
   private $inviteePHIDs;
   private $creatorPHIDs;
   private $isCancelled;
   private $eventsWithNoParent;
   private $instanceSequencePairs;
 
   private $generateGhosts = false;
 
   public function newResultObject() {
     return new PhabricatorCalendarEvent();
   }
 
   public function setGenerateGhosts($generate_ghosts) {
     $this->generateGhosts = $generate_ghosts;
     return $this;
   }
 
   public function withIDs(array $ids) {
     $this->ids = $ids;
     return $this;
   }
 
   public function withPHIDs(array $phids) {
     $this->phids = $phids;
     return $this;
   }
 
   public function withDateRange($begin, $end) {
     $this->rangeBegin = $begin;
     $this->rangeEnd = $end;
     return $this;
   }
 
   public function withInvitedPHIDs(array $phids) {
     $this->inviteePHIDs = $phids;
     return $this;
   }
 
   public function withCreatorPHIDs(array $phids) {
     $this->creatorPHIDs = $phids;
     return $this;
   }
 
   public function withIsCancelled($is_cancelled) {
     $this->isCancelled = $is_cancelled;
     return $this;
   }
 
   public function withEventsWithNoParent($events_with_no_parent) {
     $this->eventsWithNoParent = $events_with_no_parent;
     return $this;
   }
 
   public function withInstanceSequencePairs(array $pairs) {
     $this->instanceSequencePairs = $pairs;
     return $this;
   }
 
   protected function getDefaultOrderVector() {
     return array('start', 'id');
   }
 
   public function getOrderableColumns() {
     return array(
       'start' => array(
         'table' => $this->getPrimaryTableAlias(),
         'column' => 'dateFrom',
         'reverse' => true,
         'type' => 'int',
         'unique' => false,
       ),
     ) + parent::getOrderableColumns();
   }
 
   protected function getPagingValueMap($cursor, array $keys) {
     $event = $this->loadCursorObject($cursor);
     return array(
       'start' => $event->getDateFrom(),
       'id' => $event->getID(),
     );
   }
 
   protected function loadPage() {
-    $table = new PhabricatorCalendarEvent();
-    $conn_r = $table->establishConnection('r');
-    $viewer = $this->getViewer();
-
-    $data = queryfx_all(
-      $conn_r,
-      'SELECT event.* FROM %T event %Q %Q %Q %Q %Q',
-      $table->getTableName(),
-      $this->buildJoinClause($conn_r),
-      $this->buildWhereClause($conn_r),
-      $this->buildGroupClause($conn_r),
-      $this->buildOrderClause($conn_r),
-      $this->buildLimitClause($conn_r));
-
-    $events = $table->loadAllFromArray($data);
+    $events = $this->loadStandardPage($this->newResultObject());
 
+    $viewer = $this->getViewer();
     foreach ($events as $event) {
-      $event->applyViewerTimezone($this->getViewer());
+      $event->applyViewerTimezone($viewer);
     }
 
     if (!$this->generateGhosts) {
       return $events;
     }
 
     $enforced_end = null;
+    $raw_limit = $this->getRawResultLimit();
+
+    if (!$raw_limit && !$this->rangeEnd) {
+      throw new Exception(
+        pht(
+          'Event queries which generate ghost events must include either a '.
+          'result limit or an end date, because they may otherwise generate '.
+          'an infinite number of results. This query has neither.'));
+    }
 
     foreach ($events as $key => $event) {
       $sequence_start = 0;
       $sequence_end = null;
       $duration = $event->getDateTo() - $event->getDateFrom();
       $end = null;
 
       $instance_of = $event->getInstanceOfEventPHID();
 
       if ($instance_of == null && $this->isCancelled !== null) {
         if ($event->getIsCancelled() != $this->isCancelled) {
           unset($events[$key]);
           continue;
         }
       }
 
       if ($event->getIsRecurring() && $instance_of == null) {
         $frequency = $event->getFrequencyUnit();
         $modify_key = '+1 '.$frequency;
 
         if ($this->rangeBegin && $this->rangeBegin > $event->getDateFrom()) {
           $max_date = $this->rangeBegin - $duration;
           $date = $event->getDateFrom();
           $datetime = PhabricatorTime::getDateTimeFromEpoch($date, $viewer);
 
           while ($date < $max_date) {
             // TODO: optimize this to not loop through all off-screen events
             $sequence_start++;
             $datetime = PhabricatorTime::getDateTimeFromEpoch($date, $viewer);
             $date = $datetime->modify($modify_key)->format('U');
           }
 
           $start = $this->rangeBegin;
         } else {
           $start = $event->getDateFrom() - $duration;
         }
 
         $date = $start;
         $datetime = PhabricatorTime::getDateTimeFromEpoch($date, $viewer);
 
         if (($this->rangeEnd && $event->getRecurrenceEndDate()) &&
           $this->rangeEnd < $event->getRecurrenceEndDate()) {
           $end = $this->rangeEnd;
         } else if ($event->getRecurrenceEndDate()) {
           $end = $event->getRecurrenceEndDate();
         } else if ($this->rangeEnd) {
           $end = $this->rangeEnd;
         } else if ($enforced_end) {
           if ($end) {
             $end = min($end, $enforced_end);
           } else {
             $end = $enforced_end;
           }
         }
 
         if ($end) {
           $sequence_end = $sequence_start;
           while ($date < $end) {
             $sequence_end++;
             $datetime->modify($modify_key);
             $date = $datetime->format('U');
-            if ($sequence_end > $this->getRawResultLimit() + $sequence_start) {
+            if ($sequence_end > $raw_limit + $sequence_start) {
               break;
             }
           }
         } else {
-          $sequence_end = $this->getRawResultLimit() + $sequence_start;
+          $sequence_end = $raw_limit + $sequence_start;
         }
 
         $sequence_start = max(1, $sequence_start);
 
         for ($index = $sequence_start; $index < $sequence_end; $index++) {
           $events[] = $event->generateNthGhost($index, $viewer);
         }
 
-        if (count($events) >= $this->getRawResultLimit()) {
-          $events = msort($events, 'getDateFrom');
-          $events = array_slice($events, 0, $this->getRawResultLimit(), true);
-          $enforced_end = last($events)->getDateFrom();
+        // NOTE: We're slicing results every time because this makes it cheaper
+        // to generate future ghosts. If we already have 100 events that occur
+        // before July 1, we know we never need to generate ghosts after that
+        // because they couldn't possibly ever appear in the result set.
+
+        if ($raw_limit) {
+          if (count($events) >= $raw_limit) {
+            $events = msort($events, 'getDateFrom');
+            $events = array_slice($events, 0, $raw_limit, true);
+            $enforced_end = last($events)->getDateFrom();
+          }
         }
       }
     }
 
     $map = array();
     $instance_sequence_pairs = array();
 
     foreach ($events as $key => $event) {
       if ($event->getIsGhostEvent()) {
         $index = $event->getSequenceIndex();
         $instance_sequence_pairs[] = array($event->getPHID(), $index);
         $map[$event->getPHID()][$index] = $key;
       }
     }
 
     if (count($instance_sequence_pairs) > 0) {
       $sub_query = id(new PhabricatorCalendarEventQuery())
         ->setViewer($viewer)
         ->setParentQuery($this)
         ->withInstanceSequencePairs($instance_sequence_pairs)
         ->execute();
 
       foreach ($sub_query as $edited_ghost) {
         $indexes = idx($map, $edited_ghost->getInstanceOfEventPHID());
         $key = idx($indexes, $edited_ghost->getSequenceIndex());
         $events[$key] = $edited_ghost;
       }
 
       $id_map = array();
       foreach ($events as $key => $event) {
         if ($event->getIsGhostEvent()) {
           continue;
         }
         if (isset($id_map[$event->getID()])) {
           unset($events[$key]);
         } else {
           $id_map[$event->getID()] = true;
         }
       }
     }
 
     return $events;
   }
 
   protected function buildJoinClauseParts(AphrontDatabaseConnection $conn_r) {
     $parts = parent::buildJoinClauseParts($conn_r);
     if ($this->inviteePHIDs !== null) {
       $parts[] = qsprintf(
         $conn_r,
         'JOIN %T invitee ON invitee.eventPHID = event.phid
           AND invitee.status != %s',
         id(new PhabricatorCalendarEventInvitee())->getTableName(),
         PhabricatorCalendarEventInvitee::STATUS_UNINVITED);
     }
     return $parts;
   }
 
-  protected function buildWhereClause(AphrontDatabaseConnection $conn_r) {
-    $where = array();
+  protected function buildWhereClauseParts(AphrontDatabaseConnection $conn) {
+    $where = parent::buildWhereClauseParts($conn);
 
     if ($this->ids) {
       $where[] = qsprintf(
-        $conn_r,
+        $conn,
         'event.id IN (%Ld)',
         $this->ids);
     }
 
     if ($this->phids) {
       $where[] = qsprintf(
-        $conn_r,
+        $conn,
         'event.phid IN (%Ls)',
         $this->phids);
     }
 
     if ($this->rangeBegin) {
       $where[] = qsprintf(
-        $conn_r,
+        $conn,
         'event.dateTo >= %d OR event.isRecurring = 1',
         $this->rangeBegin);
     }
 
     if ($this->rangeEnd) {
       $where[] = qsprintf(
-        $conn_r,
+        $conn,
         'event.dateFrom <= %d',
         $this->rangeEnd);
     }
 
     if ($this->inviteePHIDs !== null) {
       $where[] = qsprintf(
-        $conn_r,
+        $conn,
         'invitee.inviteePHID IN (%Ls)',
         $this->inviteePHIDs);
     }
 
     if ($this->creatorPHIDs) {
       $where[] = qsprintf(
-        $conn_r,
+        $conn,
         'event.userPHID IN (%Ls)',
         $this->creatorPHIDs);
     }
 
     if ($this->isCancelled !== null) {
       $where[] = qsprintf(
-        $conn_r,
+        $conn,
         'event.isCancelled = %d',
         (int)$this->isCancelled);
     }
 
     if ($this->eventsWithNoParent == true) {
       $where[] = qsprintf(
-        $conn_r,
+        $conn,
         'event.instanceOfEventPHID IS NULL');
     }
 
     if ($this->instanceSequencePairs !== null) {
       $sql = array();
 
       foreach ($this->instanceSequencePairs as $pair) {
         $sql[] = qsprintf(
-          $conn_r,
+          $conn,
           '(event.instanceOfEventPHID = %s AND event.sequenceIndex = %d)',
           $pair[0],
           $pair[1]);
       }
+
       $where[] = qsprintf(
-        $conn_r,
+        $conn,
         '%Q',
         implode(' OR ', $sql));
     }
 
-    $where[] = $this->buildPagingClause($conn_r);
-
-    return $this->formatWhereClause($where);
+    return $where;
   }
 
   protected function getPrimaryTableAlias() {
     return 'event';
   }
 
   protected function shouldGroupQueryResultRows() {
     if ($this->inviteePHIDs !== null) {
       return true;
     }
     return parent::shouldGroupQueryResultRows();
   }
 
   protected function getApplicationSearchObjectPHIDColumn() {
     return 'event.phid';
   }
 
   public function getQueryApplicationClass() {
     return 'PhabricatorCalendarApplication';
   }
 
 
   protected function willFilterPage(array $events) {
     $range_start = $this->rangeBegin;
     $range_end = $this->rangeEnd;
     $instance_of_event_phids = array();
     $recurring_events = array();
     $viewer = $this->getViewer();
 
     foreach ($events as $key => $event) {
       $event_start = $event->getDateFrom();
       $event_end = $event->getDateTo();
 
       if ($range_start && $event_end < $range_start) {
         unset($events[$key]);
       }
       if ($range_end && $event_start > $range_end) {
         unset($events[$key]);
       }
     }
 
     $phids = array();
 
     foreach ($events as $event) {
       $phids[] = $event->getPHID();
       $instance_of = $event->getInstanceOfEventPHID();
 
       if ($instance_of) {
         $instance_of_event_phids[] = $instance_of;
       }
     }
 
     if (count($instance_of_event_phids) > 0) {
       $recurring_events = id(new PhabricatorCalendarEventQuery())
         ->setViewer($viewer)
         ->withPHIDs($instance_of_event_phids)
         ->withEventsWithNoParent(true)
         ->execute();
 
       $recurring_events = mpull($recurring_events, null, 'getPHID');
     }
 
     if ($events) {
       $invitees = id(new PhabricatorCalendarEventInviteeQuery())
         ->setViewer($viewer)
         ->withEventPHIDs($phids)
         ->execute();
       $invitees = mgroup($invitees, 'getEventPHID');
     } else {
       $invitees = array();
     }
 
     foreach ($events as $key => $event) {
       $event_invitees = idx($invitees, $event->getPHID(), array());
       $event->attachInvitees($event_invitees);
 
       $instance_of = $event->getInstanceOfEventPHID();
       if (!$instance_of) {
         continue;
       }
       $parent = idx($recurring_events, $instance_of);
 
       // should never get here
       if (!$parent) {
         unset($events[$key]);
         continue;
       }
       $event->attachParentEvent($parent);
 
       if ($this->isCancelled !== null) {
         if ($event->getIsCancelled() != $this->isCancelled) {
           unset($events[$key]);
           continue;
         }
       }
     }
 
     $events = msort($events, 'getDateFrom');
 
     return $events;
   }
 
 }
diff --git a/src/applications/people/query/PhabricatorPeopleQuery.php b/src/applications/people/query/PhabricatorPeopleQuery.php
index 0bdb9fab2d..77feeb313a 100644
--- a/src/applications/people/query/PhabricatorPeopleQuery.php
+++ b/src/applications/people/query/PhabricatorPeopleQuery.php
@@ -1,480 +1,484 @@
 <?php
 
 final class PhabricatorPeopleQuery
   extends PhabricatorCursorPagedPolicyAwareQuery {
 
   private $usernames;
   private $realnames;
   private $emails;
   private $phids;
   private $ids;
   private $dateCreatedAfter;
   private $dateCreatedBefore;
   private $isAdmin;
   private $isSystemAgent;
   private $isMailingList;
   private $isDisabled;
   private $isApproved;
   private $nameLike;
   private $nameTokens;
 
   private $needPrimaryEmail;
   private $needProfile;
   private $needProfileImage;
   private $needAvailability;
   private $needBadges;
 
   public function withIDs(array $ids) {
     $this->ids = $ids;
     return $this;
   }
 
   public function withPHIDs(array $phids) {
     $this->phids = $phids;
     return $this;
   }
 
   public function withEmails(array $emails) {
     $this->emails = $emails;
     return $this;
   }
 
   public function withRealnames(array $realnames) {
     $this->realnames = $realnames;
     return $this;
   }
 
   public function withUsernames(array $usernames) {
     $this->usernames = $usernames;
     return $this;
   }
 
   public function withDateCreatedBefore($date_created_before) {
     $this->dateCreatedBefore = $date_created_before;
     return $this;
   }
 
   public function withDateCreatedAfter($date_created_after) {
     $this->dateCreatedAfter = $date_created_after;
     return $this;
   }
 
   public function withIsAdmin($admin) {
     $this->isAdmin = $admin;
     return $this;
   }
 
   public function withIsSystemAgent($system_agent) {
     $this->isSystemAgent = $system_agent;
     return $this;
   }
 
   public function withIsMailingList($mailing_list) {
     $this->isMailingList = $mailing_list;
     return $this;
   }
 
   public function withIsDisabled($disabled) {
     $this->isDisabled = $disabled;
     return $this;
   }
 
   public function withIsApproved($approved) {
     $this->isApproved = $approved;
     return $this;
   }
 
   public function withNameLike($like) {
     $this->nameLike = $like;
     return $this;
   }
 
   public function withNameTokens(array $tokens) {
     $this->nameTokens = array_values($tokens);
     return $this;
   }
 
   public function needPrimaryEmail($need) {
     $this->needPrimaryEmail = $need;
     return $this;
   }
 
   public function needProfile($need) {
     $this->needProfile = $need;
     return $this;
   }
 
   public function needProfileImage($need) {
     $this->needProfileImage = $need;
     return $this;
   }
 
   public function needAvailability($need) {
     $this->needAvailability = $need;
     return $this;
   }
 
   public function needBadges($need) {
     $this->needBadges = $need;
     return $this;
   }
 
   public function newResultObject() {
     return new PhabricatorUser();
   }
 
   protected function loadPage() {
     $table = new PhabricatorUser();
     $data = $this->loadStandardPageRows($table);
 
     if ($this->needPrimaryEmail) {
       $table->putInSet(new LiskDAOSet());
     }
 
     return $table->loadAllFromArray($data);
   }
 
   protected function didFilterPage(array $users) {
     if ($this->needProfile) {
       $user_list = mpull($users, null, 'getPHID');
       $profiles = new PhabricatorUserProfile();
       $profiles = $profiles->loadAllWhere(
         'userPHID IN (%Ls)',
         array_keys($user_list));
 
       $profiles = mpull($profiles, null, 'getUserPHID');
       foreach ($user_list as $user_phid => $user) {
         $profile = idx($profiles, $user_phid);
 
         if (!$profile) {
           $profile = PhabricatorUserProfile::initializeNewProfile($user);
         }
 
         $user->attachUserProfile($profile);
       }
     }
 
     if ($this->needBadges) {
       $awards = id(new PhabricatorBadgesAwardQuery())
         ->setViewer($this->getViewer())
         ->withRecipientPHIDs(mpull($users, 'getPHID'))
         ->execute();
 
       $awards = mgroup($awards, 'getRecipientPHID');
 
       foreach ($users as $user) {
         $user_awards = idx($awards, $user->getPHID(), array());
         $badge_phids = mpull($user_awards, 'getBadgePHID');
         $user->attachBadgePHIDs($badge_phids);
       }
     }
 
     if ($this->needProfileImage) {
       $rebuild = array();
       foreach ($users as $user) {
         $image_uri = $user->getProfileImageCache();
         if ($image_uri) {
           // This user has a valid cache, so we don't need to fetch any
           // data or rebuild anything.
 
           $user->attachProfileImageURI($image_uri);
           continue;
         }
 
         // This user's cache is invalid or missing, so we're going to rebuild
         // it.
         $rebuild[] = $user;
       }
 
       if ($rebuild) {
         $file_phids = mpull($rebuild, 'getProfileImagePHID');
         $file_phids = array_filter($file_phids);
 
         if ($file_phids) {
           // NOTE: We're using the omnipotent user here because older profile
           // images do not have the 'profile' flag, so they may not be visible
           // to the executing viewer. At some point, we could migrate to add
           // this flag and then use the real viewer, or just use the real
           // viewer after enough time has passed to limit the impact of old
           // data. The consequence of missing here is that we cache a default
           // image when a real image exists.
           $files = id(new PhabricatorFileQuery())
             ->setParentQuery($this)
             ->setViewer(PhabricatorUser::getOmnipotentUser())
             ->withPHIDs($file_phids)
             ->execute();
           $files = mpull($files, null, 'getPHID');
         } else {
           $files = array();
         }
 
         foreach ($rebuild as $user) {
           $image_phid = $user->getProfileImagePHID();
           if (isset($files[$image_phid])) {
             $image_uri = $files[$image_phid]->getBestURI();
           } else {
             $image_uri = PhabricatorUser::getDefaultProfileImageURI();
           }
 
           $user->writeProfileImageCache($image_uri);
           $user->attachProfileImageURI($image_uri);
         }
       }
     }
 
     if ($this->needAvailability) {
       $rebuild = array();
       foreach ($users as $user) {
         $cache = $user->getAvailabilityCache();
         if ($cache !== null) {
           $user->attachAvailability($cache);
         } else {
           $rebuild[] = $user;
         }
       }
 
       if ($rebuild) {
         $this->rebuildAvailabilityCache($rebuild);
       }
     }
 
     return $users;
   }
 
   protected function shouldGroupQueryResultRows() {
     if ($this->nameTokens) {
       return true;
     }
 
     return parent::shouldGroupQueryResultRows();
   }
 
   protected function buildJoinClauseParts(AphrontDatabaseConnection $conn) {
     $joins = parent::buildJoinClauseParts($conn);
 
     if ($this->emails) {
       $email_table = new PhabricatorUserEmail();
       $joins[] = qsprintf(
         $conn,
         'JOIN %T email ON email.userPHID = user.PHID',
         $email_table->getTableName());
     }
 
     if ($this->nameTokens) {
       foreach ($this->nameTokens as $key => $token) {
         $token_table = 'token_'.$key;
         $joins[] = qsprintf(
           $conn,
           'JOIN %T %T ON %T.userID = user.id AND %T.token LIKE %>',
           PhabricatorUser::NAMETOKEN_TABLE,
           $token_table,
           $token_table,
           $token_table,
           $token);
       }
     }
 
     return  $joins;
   }
 
   protected function buildWhereClauseParts(AphrontDatabaseConnection $conn) {
     $where = parent::buildWhereClauseParts($conn);
 
     if ($this->usernames !== null) {
       $where[] = qsprintf(
         $conn,
         'user.userName IN (%Ls)',
         $this->usernames);
     }
 
     if ($this->emails !== null) {
       $where[] = qsprintf(
         $conn,
         'email.address IN (%Ls)',
         $this->emails);
     }
 
     if ($this->realnames !== null) {
       $where[] = qsprintf(
         $conn,
         'user.realName IN (%Ls)',
         $this->realnames);
     }
 
     if ($this->phids !== null) {
       $where[] = qsprintf(
         $conn,
         'user.phid IN (%Ls)',
         $this->phids);
     }
 
     if ($this->ids !== null) {
       $where[] = qsprintf(
         $conn,
         'user.id IN (%Ld)',
         $this->ids);
     }
 
     if ($this->dateCreatedAfter) {
       $where[] = qsprintf(
         $conn,
         'user.dateCreated >= %d',
         $this->dateCreatedAfter);
     }
 
     if ($this->dateCreatedBefore) {
       $where[] = qsprintf(
         $conn,
         'user.dateCreated <= %d',
         $this->dateCreatedBefore);
     }
 
     if ($this->isAdmin !== null) {
       $where[] = qsprintf(
         $conn,
         'user.isAdmin = %d',
         (int)$this->isAdmin);
     }
 
     if ($this->isDisabled !== null) {
       $where[] = qsprintf(
         $conn,
         'user.isDisabled = %d',
         (int)$this->isDisabled);
     }
 
     if ($this->isApproved !== null) {
       $where[] = qsprintf(
         $conn,
         'user.isApproved = %d',
         (int)$this->isApproved);
     }
 
     if ($this->isSystemAgent !== null) {
       $where[] = qsprintf(
         $conn,
         'user.isSystemAgent = %d',
         (int)$this->isSystemAgent);
     }
 
     if ($this->isMailingList !== null) {
       $where[] = qsprintf(
         $conn,
         'user.isMailingList = %d',
         (int)$this->isMailingList);
     }
 
     if (strlen($this->nameLike)) {
       $where[] = qsprintf(
         $conn,
         'user.username LIKE %~ OR user.realname LIKE %~',
         $this->nameLike,
         $this->nameLike);
     }
 
     return $where;
   }
 
   protected function getPrimaryTableAlias() {
     return 'user';
   }
 
   public function getQueryApplicationClass() {
     return 'PhabricatorPeopleApplication';
   }
 
   public function getOrderableColumns() {
     return parent::getOrderableColumns() + array(
       'username' => array(
         'table' => 'user',
         'column' => 'username',
         'type' => 'string',
         'reverse' => true,
         'unique' => true,
       ),
     );
   }
 
   protected function getPagingValueMap($cursor, array $keys) {
     $user = $this->loadCursorObject($cursor);
     return array(
       'id' => $user->getID(),
       'username' => $user->getUsername(),
     );
   }
 
   private function rebuildAvailabilityCache(array $rebuild) {
     $rebuild = mpull($rebuild, null, 'getPHID');
 
     // Limit the window we look at because far-future events are largely
     // irrelevant and this makes the cache cheaper to build and allows it to
     // self-heal over time.
     $min_range = PhabricatorTime::getNow();
     $max_range = $min_range + phutil_units('72 hours in seconds');
 
+    // NOTE: We don't need to generate ghosts here, because we only care if
+    // the user is attending, and you can't attend a ghost event: RSVP'ing
+    // to it creates a real event.
+
     $events = id(new PhabricatorCalendarEventQuery())
       ->setViewer(PhabricatorUser::getOmnipotentUser())
       ->withInvitedPHIDs(array_keys($rebuild))
       ->withIsCancelled(false)
       ->withDateRange($min_range, $max_range)
       ->execute();
 
     // Group all the events by invited user. Only examine events that users
     // are actually attending.
     $map = array();
     foreach ($events as $event) {
       foreach ($event->getInvitees() as $invitee) {
         if (!$invitee->isAttending()) {
           continue;
         }
 
         $invitee_phid = $invitee->getInviteePHID();
         if (!isset($rebuild[$invitee_phid])) {
           continue;
         }
 
         $map[$invitee_phid][] = $event;
       }
     }
 
     foreach ($rebuild as $phid => $user) {
       $events = idx($map, $phid, array());
 
       $cursor = $min_range;
       if ($events) {
         // Find the next time when the user has no meetings. If we move forward
         // because of an event, we check again for events after that one ends.
         while (true) {
           foreach ($events as $event) {
             $from = $event->getDateFromForCache();
             $to = $event->getDateTo();
             if (($from <= $cursor) && ($to > $cursor)) {
               $cursor = $to;
               continue 2;
             }
           }
           break;
         }
       }
 
       if ($cursor > $min_range) {
         $availability = array(
           'until' => $cursor,
         );
         $availability_ttl = $cursor;
       } else {
         $availability = array(
           'until' => null,
         );
         $availability_ttl = $max_range;
       }
 
       // Never TTL the cache to longer than the maximum range we examined.
       $availability_ttl = min($availability_ttl, $max_range);
 
       $user->writeAvailabilityCache($availability, $availability_ttl);
       $user->attachAvailability($availability);
     }
   }
 
 }