diff --git a/resources/sql/autopatches/20161012.cal.01.import.sql b/resources/sql/autopatches/20161012.cal.01.import.sql
new file mode 100644
--- /dev/null
+++ b/resources/sql/autopatches/20161012.cal.01.import.sql
@@ -0,0 +1,15 @@
+CREATE TABLE {$NAMESPACE}_calendar.calendar_import (
+  id INT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
+  phid VARBINARY(64) NOT NULL,
+  name LONGTEXT NOT NULL COLLATE {$COLLATE_TEXT},
+  authorPHID VARBINARY(64) NOT NULL,
+  viewPolicy VARBINARY(64) NOT NULL,
+  editPolicy VARBINARY(64) NOT NULL,
+  engineType VARCHAR(64) NOT NULL,
+  parameters LONGTEXT NOT NULL COLLATE {$COLLATE_TEXT},
+  isDisabled BOOL NOT NULL,
+  dateCreated INT UNSIGNED NOT NULL,
+  dateModified INT UNSIGNED NOT NULL,
+  UNIQUE KEY `key_phid` (phid),
+  KEY `key_author` (authorPHID)
+) ENGINE=InnoDB, COLLATE {$COLLATE_TEXT};
diff --git a/resources/sql/autopatches/20161012.cal.02.importxaction.sql b/resources/sql/autopatches/20161012.cal.02.importxaction.sql
new file mode 100644
--- /dev/null
+++ b/resources/sql/autopatches/20161012.cal.02.importxaction.sql
@@ -0,0 +1,19 @@
+CREATE TABLE {$NAMESPACE}_calendar.calendar_importtransaction (
+  id INT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
+  phid VARBINARY(64) NOT NULL,
+  authorPHID VARBINARY(64) NOT NULL,
+  objectPHID VARBINARY(64) NOT NULL,
+  viewPolicy VARBINARY(64) NOT NULL,
+  editPolicy VARBINARY(64) NOT NULL,
+  commentPHID VARBINARY(64) DEFAULT NULL,
+  commentVersion INT UNSIGNED NOT NULL,
+  transactionType VARCHAR(32) COLLATE {$COLLATE_TEXT} NOT NULL,
+  oldValue LONGTEXT COLLATE {$COLLATE_TEXT} NOT NULL,
+  newValue LONGTEXT COLLATE {$COLLATE_TEXT} NOT NULL,
+  contentSource LONGTEXT COLLATE {$COLLATE_TEXT} NOT NULL,
+  metadata LONGTEXT COLLATE {$COLLATE_TEXT} NOT NULL,
+  dateCreated INT UNSIGNED NOT NULL,
+  dateModified INT UNSIGNED NOT NULL,
+  UNIQUE KEY `key_phid` (`phid`),
+  KEY `key_object` (`objectPHID`)
+) ENGINE=InnoDB, COLLATE {$COLLATE_TEXT};
diff --git a/resources/sql/autopatches/20161012.cal.03.eventimport.sql b/resources/sql/autopatches/20161012.cal.03.eventimport.sql
new file mode 100644
--- /dev/null
+++ b/resources/sql/autopatches/20161012.cal.03.eventimport.sql
@@ -0,0 +1,11 @@
+ALTER TABLE {$NAMESPACE}_calendar.calendar_event
+  ADD importAuthorPHID VARBINARY(64);
+
+ALTER TABLE {$NAMESPACE}_calendar.calendar_event
+  ADD importSourcePHID VARBINARY(64);
+
+ALTER TABLE {$NAMESPACE}_calendar.calendar_event
+  ADD importUIDIndex BINARY(12);
+
+ALTER TABLE {$NAMESPACE}_calendar.calendar_event
+  ADD importUID LONGTEXT COLLATE {$COLLATE_TEXT};
diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -2100,6 +2100,14 @@
     'PhabricatorCalendarHolidayTestCase' => 'applications/calendar/storage/__tests__/PhabricatorCalendarHolidayTestCase.php',
     'PhabricatorCalendarICSWriter' => 'applications/calendar/util/PhabricatorCalendarICSWriter.php',
     'PhabricatorCalendarIconSet' => 'applications/calendar/icon/PhabricatorCalendarIconSet.php',
+    'PhabricatorCalendarImport' => 'applications/calendar/storage/PhabricatorCalendarImport.php',
+    'PhabricatorCalendarImportEditor' => 'applications/calendar/editor/PhabricatorCalendarImportEditor.php',
+    'PhabricatorCalendarImportListController' => 'applications/calendar/controller/PhabricatorCalendarImportListController.php',
+    'PhabricatorCalendarImportPHIDType' => 'applications/calendar/phid/PhabricatorCalendarImportPHIDType.php',
+    'PhabricatorCalendarImportQuery' => 'applications/calendar/query/PhabricatorCalendarImportQuery.php',
+    'PhabricatorCalendarImportSearchEngine' => 'applications/calendar/query/PhabricatorCalendarImportSearchEngine.php',
+    'PhabricatorCalendarImportTransaction' => 'applications/calendar/storage/PhabricatorCalendarImportTransaction.php',
+    'PhabricatorCalendarImportTransactionQuery' => 'applications/calendar/query/PhabricatorCalendarImportTransactionQuery.php',
     'PhabricatorCalendarRemarkupRule' => 'applications/calendar/remarkup/PhabricatorCalendarRemarkupRule.php',
     'PhabricatorCalendarReplyHandler' => 'applications/calendar/mail/PhabricatorCalendarReplyHandler.php',
     'PhabricatorCalendarSchemaSpec' => 'applications/calendar/storage/PhabricatorCalendarSchemaSpec.php',
@@ -6789,6 +6797,7 @@
     'PhabricatorCalendarEvent' => array(
       'PhabricatorCalendarDAO',
       'PhabricatorPolicyInterface',
+      'PhabricatorExtendedPolicyInterface',
       'PhabricatorProjectInterface',
       'PhabricatorMarkupInterface',
       'PhabricatorApplicationTransactionInterface',
@@ -6879,6 +6888,19 @@
     'PhabricatorCalendarHolidayTestCase' => 'PhabricatorTestCase',
     'PhabricatorCalendarICSWriter' => 'Phobject',
     'PhabricatorCalendarIconSet' => 'PhabricatorIconSet',
+    'PhabricatorCalendarImport' => array(
+      'PhabricatorCalendarDAO',
+      'PhabricatorPolicyInterface',
+      'PhabricatorApplicationTransactionInterface',
+      'PhabricatorDestructibleInterface',
+    ),
+    'PhabricatorCalendarImportEditor' => 'PhabricatorApplicationTransactionEditor',
+    'PhabricatorCalendarImportListController' => 'PhabricatorCalendarController',
+    'PhabricatorCalendarImportPHIDType' => 'PhabricatorPHIDType',
+    'PhabricatorCalendarImportQuery' => 'PhabricatorCursorPagedPolicyAwareQuery',
+    'PhabricatorCalendarImportSearchEngine' => 'PhabricatorApplicationSearchEngine',
+    'PhabricatorCalendarImportTransaction' => 'PhabricatorModularTransaction',
+    'PhabricatorCalendarImportTransactionQuery' => 'PhabricatorApplicationTransactionQuery',
     'PhabricatorCalendarRemarkupRule' => 'PhabricatorObjectRemarkupRule',
     'PhabricatorCalendarReplyHandler' => 'PhabricatorApplicationTransactionReplyHandler',
     'PhabricatorCalendarSchemaSpec' => 'PhabricatorConfigSchemaSpec',
diff --git a/src/applications/calendar/application/PhabricatorCalendarApplication.php b/src/applications/calendar/application/PhabricatorCalendarApplication.php
--- a/src/applications/calendar/application/PhabricatorCalendarApplication.php
+++ b/src/applications/calendar/application/PhabricatorCalendarApplication.php
@@ -73,7 +73,16 @@
             => 'PhabricatorCalendarExportICSController',
           'disable/(?P<id>[1-9]\d*)/'
             => 'PhabricatorCalendarExportDisableController',
-
+        ),
+        'import/' => array(
+          $this->getQueryRoutePattern()
+            => 'PhabricatorCalendarImportListController',
+          $this->getEditRoutePattern('edit/')
+            => 'PhabricatorCalendarImportEditController',
+          '(?P<id>[1-9]\d*)/'
+            => 'PhabricatorCalendarImportViewController',
+          'disable/(?P<id>[1-9]\d*)/'
+            => 'PhabricatorCalendarImportDisableController',
         ),
       ),
     );
diff --git a/src/applications/calendar/controller/PhabricatorCalendarEventListController.php b/src/applications/calendar/controller/PhabricatorCalendarEventListController.php
--- a/src/applications/calendar/controller/PhabricatorCalendarEventListController.php
+++ b/src/applications/calendar/controller/PhabricatorCalendarEventListController.php
@@ -44,6 +44,10 @@
       ->setName(pht('Import/Export'));
 
     $items[] = id(new PHUIListItemView())
+      ->setName('Imports')
+      ->setHref('/calendar/import/');
+
+    $items[] = id(new PHUIListItemView())
       ->setName('Exports')
       ->setHref('/calendar/export/');
 
diff --git a/src/applications/calendar/controller/PhabricatorCalendarImportListController.php b/src/applications/calendar/controller/PhabricatorCalendarImportListController.php
new file mode 100644
--- /dev/null
+++ b/src/applications/calendar/controller/PhabricatorCalendarImportListController.php
@@ -0,0 +1,12 @@
+<?php
+
+final class PhabricatorCalendarImportListController
+  extends PhabricatorCalendarController {
+
+  public function handleRequest(AphrontRequest $request) {
+    return id(new PhabricatorCalendarImportSearchEngine())
+      ->setController($this)
+      ->buildResponse();
+  }
+
+}
diff --git a/src/applications/calendar/editor/PhabricatorCalendarImportEditor.php b/src/applications/calendar/editor/PhabricatorCalendarImportEditor.php
new file mode 100644
--- /dev/null
+++ b/src/applications/calendar/editor/PhabricatorCalendarImportEditor.php
@@ -0,0 +1,18 @@
+<?php
+
+final class PhabricatorCalendarImportEditor
+  extends PhabricatorApplicationTransactionEditor {
+
+  public function getEditorApplicationClass() {
+    return 'PhabricatorCalendarApplication';
+  }
+
+  public function getEditorObjectsDescription() {
+    return pht('Calendar Imports');
+  }
+
+  public function getCreateObjectTitle($author, $object) {
+    return pht('%s created this import.', $author);
+  }
+
+}
diff --git a/src/applications/calendar/phid/PhabricatorCalendarImportPHIDType.php b/src/applications/calendar/phid/PhabricatorCalendarImportPHIDType.php
new file mode 100644
--- /dev/null
+++ b/src/applications/calendar/phid/PhabricatorCalendarImportPHIDType.php
@@ -0,0 +1,50 @@
+<?php
+
+final class PhabricatorCalendarImportPHIDType extends PhabricatorPHIDType {
+
+  const TYPECONST = 'CIMP';
+
+  public function getTypeName() {
+    return pht('Calendar Import');
+  }
+
+  public function newObject() {
+    return new PhabricatorCalendarImport();
+  }
+
+  public function getPHIDTypeApplicationClass() {
+    return 'PhabricatorCalendarApplication';
+  }
+
+  protected function buildQueryForObjects(
+    PhabricatorObjectQuery $query,
+    array $phids) {
+
+    return id(new PhabricatorCalendarImportQuery())
+      ->withPHIDs($phids);
+  }
+
+  public function loadHandles(
+    PhabricatorHandleQuery $query,
+    array $handles,
+    array $objects) {
+
+    foreach ($handles as $phid => $handle) {
+      $import = $objects[$phid];
+
+      $id = $import->getID();
+      $name = $import->getName();
+      $uri = $import->getURI();
+
+      $handle
+        ->setName($name)
+        ->setFullName(pht('Calendar Import %s: %s', $id, $name))
+        ->setURI($uri);
+
+      if ($import->getIsDisabled()) {
+        $handle->setStatus(PhabricatorObjectHandle::STATUS_CLOSED);
+      }
+    }
+  }
+
+}
diff --git a/src/applications/calendar/query/PhabricatorCalendarEventQuery.php b/src/applications/calendar/query/PhabricatorCalendarEventQuery.php
--- a/src/applications/calendar/query/PhabricatorCalendarEventQuery.php
+++ b/src/applications/calendar/query/PhabricatorCalendarEventQuery.php
@@ -14,6 +14,7 @@
   private $instanceSequencePairs;
   private $isStub;
   private $parentEventPHIDs;
+  private $importSourcePHIDs;
 
   private $generateGhosts = false;
 
@@ -77,6 +78,11 @@
     return $this;
   }
 
+  public function withImportSourcePHIDs(array $import_phids) {
+    $this->importSourcePHIDs = $import_phids;
+    return $this;
+  }
+
   protected function getDefaultOrderVector() {
     return array('start', 'id');
   }
@@ -411,6 +417,13 @@
         $this->parentEventPHIDs);
     }
 
+    if ($this->importSourcePHIDs !== null) {
+      $where[] = qsprintf(
+        $conn,
+        'event.importSourcePHID IN (%Ls)',
+        $this->importSourcePHIDs);
+    }
+
     return $where;
   }
 
@@ -441,6 +454,42 @@
 
     $events = $this->getEventsInRange($events);
 
+    $import_phids = array();
+    foreach ($events as $event) {
+      $import_phid = $event->getImportSourcePHID();
+      if ($import_phid !== null) {
+        $import_phids[$import_phid] = $import_phid;
+      }
+    }
+
+    if ($import_phids) {
+      $imports = id(new PhabricatorCalendarImportQuery())
+        ->setParentQuery($this)
+        ->setViewer($viewer)
+        ->withPHIDs($import_phids)
+        ->execute();
+      $sources = mpull($sources, null, 'getPHID');
+    } else {
+      $sources = array();
+    }
+
+    foreach ($events as $key => $event) {
+      $import_phid = $event->getImportSourcePHID();
+      if ($import_phid === null) {
+        $event->attachImportSource(null);
+        continue;
+      }
+
+      $import = idx($imports, $import_phid);
+      if (!$import) {
+        unset($events[$key]);
+        $this->didRejectResult($event);
+        continue;
+      }
+
+      $event->attachImportSource($import);
+    }
+
     $phids = array();
 
     foreach ($events as $event) {
@@ -561,5 +610,4 @@
     return $raw_limit;
   }
 
-
 }
diff --git a/src/applications/calendar/query/PhabricatorCalendarImportQuery.php b/src/applications/calendar/query/PhabricatorCalendarImportQuery.php
new file mode 100644
--- /dev/null
+++ b/src/applications/calendar/query/PhabricatorCalendarImportQuery.php
@@ -0,0 +1,81 @@
+<?php
+
+final class PhabricatorCalendarImportQuery
+  extends PhabricatorCursorPagedPolicyAwareQuery {
+
+  private $ids;
+  private $phids;
+  private $authorPHIDs;
+  private $isDisabled;
+
+  public function withIDs(array $ids) {
+    $this->ids = $ids;
+    return $this;
+  }
+
+  public function withPHIDs(array $phids) {
+    $this->phids = $phids;
+    return $this;
+  }
+
+  public function withAuthorPHIDs(array $phids) {
+    $this->authorPHIDs = $phids;
+    return $this;
+  }
+
+  public function withIsDisabled($is_disabled) {
+    $this->isDisabled = $is_disabled;
+    return $this;
+  }
+
+  public function newResultObject() {
+    return new PhabricatorCalendarImport();
+  }
+
+  protected function loadPage() {
+    return $this->loadStandardPage($this->newResultObject());
+  }
+
+  protected function buildWhereClauseParts(AphrontDatabaseConnection $conn) {
+    $where = parent::buildWhereClauseParts($conn);
+
+    if ($this->ids !== null) {
+      $where[] = qsprintf(
+        $conn,
+        'import.id IN (%Ld)',
+        $this->ids);
+    }
+
+    if ($this->phids !== null) {
+      $where[] = qsprintf(
+        $conn,
+        'import.phid IN (%Ls)',
+        $this->phids);
+    }
+
+    if ($this->authorPHIDs !== null) {
+      $where[] = qsprintf(
+        $conn,
+        'import.authorPHID IN (%Ls)',
+        $this->authorPHIDs);
+    }
+
+    if ($this->isDisabled !== null) {
+      $where[] = qsprintf(
+        $conn,
+        'import.isDisabled = %d',
+        (int)$this->isDisabled);
+    }
+
+    return $where;
+  }
+
+  protected function getPrimaryTableAlias() {
+    return 'import';
+  }
+
+  public function getQueryApplicationClass() {
+    return 'PhabricatorCalendarApplication';
+  }
+
+}
diff --git a/src/applications/calendar/query/PhabricatorCalendarImportSearchEngine.php b/src/applications/calendar/query/PhabricatorCalendarImportSearchEngine.php
new file mode 100644
--- /dev/null
+++ b/src/applications/calendar/query/PhabricatorCalendarImportSearchEngine.php
@@ -0,0 +1,81 @@
+<?php
+
+final class PhabricatorCalendarImportSearchEngine
+  extends PhabricatorApplicationSearchEngine {
+
+  public function getResultTypeDescription() {
+    return pht('Calendar Imports');
+  }
+
+  public function getApplicationClassName() {
+    return 'PhabricatorCalendarApplication';
+  }
+
+  public function newQuery() {
+    return new PhabricatorCalendarImportQuery();
+  }
+
+  protected function buildCustomSearchFields() {
+    return array();
+  }
+
+  protected function buildQueryFromParameters(array $map) {
+    $query = $this->newQuery();
+
+    return $query;
+  }
+
+  protected function getURI($path) {
+    return '/calendar/import/'.$path;
+  }
+
+  protected function getBuiltinQueryNames() {
+    $names = array(
+      'all' => pht('All Imports'),
+    );
+
+    return $names;
+  }
+
+  public function buildSavedQueryFromBuiltin($query_key) {
+    $query = $this->newSavedQuery();
+    $query->setQueryKey($query_key);
+
+    switch ($query_key) {
+      case 'all':
+        return $query;
+    }
+
+    return parent::buildSavedQueryFromBuiltin($query_key);
+  }
+
+  protected function renderResultList(
+    array $imports,
+    PhabricatorSavedQuery $query,
+    array $handles) {
+
+    assert_instances_of($imports, 'PhabricatorCalendarImport');
+    $viewer = $this->requireViewer();
+
+    $list = new PHUIObjectItemListView();
+    foreach ($imports as $import) {
+      $item = id(new PHUIObjectItemView())
+        ->setViewer($viewer)
+        ->setObjectName(pht('Import %d', $import->getID()))
+        ->setHeader($import->getName())
+        ->setHref($import->getURI());
+
+      if ($import->getIsDisabled()) {
+        $item->setDisabled(true);
+      }
+
+      $list->addItem($item);
+    }
+
+    $result = new PhabricatorApplicationSearchResultView();
+    $result->setObjectList($list);
+    $result->setNoDataString(pht('No imports found.'));
+
+    return $result;
+  }
+}
diff --git a/src/applications/calendar/query/PhabricatorCalendarImportTransactionQuery.php b/src/applications/calendar/query/PhabricatorCalendarImportTransactionQuery.php
new file mode 100644
--- /dev/null
+++ b/src/applications/calendar/query/PhabricatorCalendarImportTransactionQuery.php
@@ -0,0 +1,10 @@
+<?php
+
+final class PhabricatorCalendarImportTransactionQuery
+  extends PhabricatorApplicationTransactionQuery {
+
+  public function getTemplateApplicationTransaction() {
+    return new PhabricatorCalendarImportTransaction();
+  }
+
+}
diff --git a/src/applications/calendar/storage/PhabricatorCalendarEvent.php b/src/applications/calendar/storage/PhabricatorCalendarEvent.php
--- a/src/applications/calendar/storage/PhabricatorCalendarEvent.php
+++ b/src/applications/calendar/storage/PhabricatorCalendarEvent.php
@@ -3,6 +3,7 @@
 final class PhabricatorCalendarEvent extends PhabricatorCalendarDAO
   implements
     PhabricatorPolicyInterface,
+    PhabricatorExtendedPolicyInterface,
     PhabricatorProjectInterface,
     PhabricatorMarkupInterface,
     PhabricatorApplicationTransactionInterface,
@@ -40,8 +41,14 @@
   protected $utcInstanceEpoch;
   protected $parameters = array();
 
+  protected $importAuthorPHID;
+  protected $importSourcePHID;
+  protected $importUIDIndex;
+  protected $importUID;
+
   private $parentEvent = self::ATTACHABLE;
   private $invitees = self::ATTACHABLE;
+  private $importSource = self::ATTACHABLE;
 
   private $viewerTimezone;
 
@@ -90,6 +97,7 @@
       ->setAllDayDateTo(0)
       ->setStartDateTime($datetime_start)
       ->setEndDateTime($datetime_end)
+      ->attachImportSource(null)
       ->applyViewerTimezone($actor);
   }
 
@@ -306,6 +314,14 @@
       $this->mailKey = Filesystem::readRandomCharacters(20);
     }
 
+    $import_uid = $this->getImportUID();
+    if ($import_uid !== null) {
+      $index = PhabricatorHash::digestForIndex($import_uid);
+    } else {
+      $index = null;
+    }
+    $this->setImportUIDIndex($index);
+
     $this->updateUTCEpochs();
 
     return parent::save();
@@ -344,6 +360,11 @@
         'utcUntilEpoch' => 'epoch?',
         'utcInstanceEpoch' => 'epoch?',
 
+        'importAuthorPHID' => 'phid?',
+        'importSourcePHID' => 'phid?',
+        'importUIDIndex' => 'bytes12?',
+        'importUID' => 'text?',
+
         // TODO: DEPRECATED.
         'allDayDateFrom' => 'epoch',
         'allDayDateTo' => 'epoch',
@@ -885,6 +906,17 @@
     return $set;
   }
 
+  public function getImportSource() {
+    return $this->assertAttached($this->importSource);
+  }
+
+  public function attachImportSource(
+    PhabricatorCalendarImport $import = null) {
+    $this->importSource = $import;
+    return $this;
+  }
+
+
 /* -(  Markup Interface  )--------------------------------------------------- */
 
 
@@ -947,11 +979,19 @@
       case PhabricatorPolicyCapability::CAN_VIEW:
         return $this->getViewPolicy();
       case PhabricatorPolicyCapability::CAN_EDIT:
-        return $this->getEditPolicy();
+        if ($this->getImportSource()) {
+          return PhabricatorPolicy::POLICY_NOONE;
+        } else {
+          return $this->getEditPolicy();
+        }
     }
   }
 
   public function hasAutomaticCapability($capability, PhabricatorUser $viewer) {
+    if ($this->getImportSource()) {
+      return false;
+    }
+
     // The host of an event can always view and edit it.
     $user_phid = $this->getHostPHID();
     if ($user_phid) {
@@ -974,12 +1014,40 @@
   }
 
   public function describeAutomaticCapability($capability) {
+    if ($this->getImportSource()) {
+      return pht(
+        'Events imported from external sources can not be edited in '.
+        'Phabricator.');
+    }
+
     return pht(
       'The host of an event can always view and edit it. Users who are '.
       'invited to an event can always view it.');
   }
 
 
+/* -(  PhabricatorExtendedPolicyInterface  )--------------------------------- */
+
+
+  public function getExtendedPolicy($capability, PhabricatorUser $viewer) {
+    $extended = array();
+
+    switch ($capability) {
+      case PhabricatorPolicyCapability::CAN_VIEW:
+        $import_source = $this->getImportSource();
+        if ($import_source) {
+          $extended[] = array(
+            $import_source,
+            PhabricatorPolicyCapability::CAN_VIEW,
+          );
+        }
+        break;
+    }
+
+    return $extended;
+  }
+
+
 /* -(  PhabricatorApplicationTransactionInterface  )------------------------- */
 
 
diff --git a/src/applications/calendar/storage/PhabricatorCalendarImport.php b/src/applications/calendar/storage/PhabricatorCalendarImport.php
new file mode 100644
--- /dev/null
+++ b/src/applications/calendar/storage/PhabricatorCalendarImport.php
@@ -0,0 +1,126 @@
+<?php
+
+final class PhabricatorCalendarImport
+  extends PhabricatorCalendarDAO
+  implements
+    PhabricatorPolicyInterface,
+    PhabricatorApplicationTransactionInterface,
+    PhabricatorDestructibleInterface {
+
+  protected $name;
+  protected $authorPHID;
+  protected $viewPolicy;
+  protected $editPolicy;
+  protected $engineType;
+  protected $parameters = array();
+  protected $isDisabled = 0;
+
+  private $engine = self::ATTACHABLE;
+
+  public static function initializeNewCalendarImport(PhabricatorUser $actor) {
+    return id(new self())
+      ->setAuthorPHID($actor->getPHID())
+      ->setViewPolicy($actor->getPHID())
+      ->setEditPolicy($actor->getPHID())
+      ->setIsDisabled(0);
+  }
+
+  protected function getConfiguration() {
+    return array(
+      self::CONFIG_AUX_PHID => true,
+      self::CONFIG_SERIALIZATION => array(
+        'parameters' => self::SERIALIZATION_JSON,
+      ),
+      self::CONFIG_COLUMN_SCHEMA => array(
+        'name' => 'text',
+        'engineType' => 'text64',
+        'isDisabled' => 'bool',
+      ),
+      self::CONFIG_KEY_SCHEMA => array(
+        'key_author' => array(
+          'columns' => array('authorPHID'),
+        ),
+      ),
+    ) + parent::getConfiguration();
+  }
+
+  public function getPHIDType() {
+    return PhabricatorCalendarImportPHIDType::TYPECONST;
+  }
+
+  public function getURI() {
+    $id = $this->getID();
+    return "/calendar/import/{$id}/";
+  }
+
+/* -(  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 $viewer) {
+    return false;
+  }
+
+  public function describeAutomaticCapability($capability) {
+    return null;
+  }
+
+
+/* -(  PhabricatorApplicationTransactionInterface  )------------------------- */
+
+
+  public function getApplicationTransactionEditor() {
+    return new PhabricatorCalendarImportEditor();
+  }
+
+  public function getApplicationTransactionObject() {
+    return $this;
+  }
+
+  public function getApplicationTransactionTemplate() {
+    return new PhabricatorCalendarImportTransaction();
+  }
+
+  public function willRenderTimeline(
+    PhabricatorApplicationTransactionView $timeline,
+    AphrontRequest $request) {
+    return $timeline;
+  }
+
+
+/* -(  PhabricatorDestructibleInterface  )----------------------------------- */
+
+
+  public function destroyObjectPermanently(
+    PhabricatorDestructionEngine $engine) {
+    $viewer = $engine->getViewer();
+
+    $this->openTransaction();
+
+      $events = id(new PhabricatorCalendarEventQuery())
+        ->withImportSourcePHIDs(array($this->getPHID()))
+        ->execute();
+      foreach ($events as $event) {
+        $engine->destroyObject($event);
+      }
+
+      $this->delete();
+    $this->saveTransaction();
+  }
+
+}
diff --git a/src/applications/calendar/storage/PhabricatorCalendarImportTransaction.php b/src/applications/calendar/storage/PhabricatorCalendarImportTransaction.php
new file mode 100644
--- /dev/null
+++ b/src/applications/calendar/storage/PhabricatorCalendarImportTransaction.php
@@ -0,0 +1,18 @@
+<?php
+
+final class PhabricatorCalendarImportTransaction
+  extends PhabricatorModularTransaction {
+
+  public function getApplicationName() {
+    return 'calendar';
+  }
+
+  public function getApplicationTransactionType() {
+    return PhabricatorCalendarImportPHIDType::TYPECONST;
+  }
+
+  public function getBaseTransactionClass() {
+    return 'PhabricatorCalendarImportTransactionType';
+  }
+
+}
diff --git a/src/applications/slowvote/storage/PhabricatorSlowvotePoll.php b/src/applications/slowvote/storage/PhabricatorSlowvotePoll.php
--- a/src/applications/slowvote/storage/PhabricatorSlowvotePoll.php
+++ b/src/applications/slowvote/storage/PhabricatorSlowvotePoll.php
@@ -187,7 +187,7 @@
     return array($this->getAuthorPHID());
   }
 
-/* -(  PhabricatorDestructableInterface  )----------------------------------- */
+/* -(  PhabricatorDestructibleInterface  )----------------------------------- */
 
   public function destroyObjectPermanently(
     PhabricatorDestructionEngine $engine) {