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
@@ -2044,6 +2044,7 @@
     'PhabricatorCalendarEventEditor' => 'applications/calendar/editor/PhabricatorCalendarEventEditor.php',
     'PhabricatorCalendarEventEmailCommand' => 'applications/calendar/command/PhabricatorCalendarEventEmailCommand.php',
     'PhabricatorCalendarEventEndDateTransaction' => 'applications/calendar/xaction/PhabricatorCalendarEventEndDateTransaction.php',
+    'PhabricatorCalendarEventExportController' => 'applications/calendar/controller/PhabricatorCalendarEventExportController.php',
     'PhabricatorCalendarEventFrequencyTransaction' => 'applications/calendar/xaction/PhabricatorCalendarEventFrequencyTransaction.php',
     'PhabricatorCalendarEventFulltextEngine' => 'applications/calendar/search/PhabricatorCalendarEventFulltextEngine.php',
     'PhabricatorCalendarEventHeraldAdapter' => 'applications/calendar/herald/PhabricatorCalendarEventHeraldAdapter.php',
@@ -6781,6 +6782,7 @@
     'PhabricatorCalendarEventEditor' => 'PhabricatorApplicationTransactionEditor',
     'PhabricatorCalendarEventEmailCommand' => 'MetaMTAEmailTransactionCommand',
     'PhabricatorCalendarEventEndDateTransaction' => 'PhabricatorCalendarEventDateTransaction',
+    'PhabricatorCalendarEventExportController' => 'PhabricatorCalendarController',
     'PhabricatorCalendarEventFrequencyTransaction' => 'PhabricatorCalendarEventTransactionType',
     'PhabricatorCalendarEventFulltextEngine' => 'PhabricatorFulltextEngine',
     'PhabricatorCalendarEventHeraldAdapter' => 'HeraldAdapter',
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
@@ -59,6 +59,8 @@
             => 'PhabricatorCalendarEventCancelController',
           '(?P<action>join|decline|accept)/(?P<id>[1-9]\d*)/'
             => 'PhabricatorCalendarEventJoinController',
+          'export/(?P<id>[1-9]\d*)/'
+            => 'PhabricatorCalendarEventExportController',
         ),
       ),
     );
diff --git a/src/applications/calendar/controller/PhabricatorCalendarEventExportController.php b/src/applications/calendar/controller/PhabricatorCalendarEventExportController.php
new file mode 100644
--- /dev/null
+++ b/src/applications/calendar/controller/PhabricatorCalendarEventExportController.php
@@ -0,0 +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();
+
+      $document_node = id(new PhutilCalendarDocumentNode())
+        ->appendChild($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/controller/PhabricatorCalendarEventViewController.php b/src/applications/calendar/controller/PhabricatorCalendarEventViewController.php
--- a/src/applications/calendar/controller/PhabricatorCalendarEventViewController.php
+++ b/src/applications/calendar/controller/PhabricatorCalendarEventViewController.php
@@ -193,6 +193,15 @@
           ->setWorkflow(true));
     }
 
+    $export_uri = $this->getApplicationURI("event/export/{$id}/");
+
+    $curtain->addAction(
+      id(new PhabricatorActionView())
+        ->setName(pht('Export as .ics'))
+        ->setIcon('fa-download')
+        ->setHref($export_uri)
+        ->setWorkflow(true));
+
     return $curtain;
   }
 
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
@@ -626,6 +626,43 @@
   }
 
 
+  public function newIntermediateEventNode() {
+    $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);
+    }
+
+    $node = id(new PhutilCalendarEventNode())
+      ->setUID($uid)
+      ->setName($this->getName())
+      ->setDescription($this->getDescription())
+      ->setCreatedDateTime($created)
+      ->setModifiedDateTime($modified)
+      ->setStartDateTime($date_start)
+      ->setEndDateTime($date_end);
+
+    return $node;
+  }
+
+
+
 /* -(  Markup Interface  )--------------------------------------------------- */