diff --git a/src/applications/calendar/query/PhabricatorCalendarEventSearchEngine.php b/src/applications/calendar/query/PhabricatorCalendarEventSearchEngine.php
--- a/src/applications/calendar/query/PhabricatorCalendarEventSearchEngine.php
+++ b/src/applications/calendar/query/PhabricatorCalendarEventSearchEngine.php
@@ -373,6 +373,7 @@
         ->setURI($event->getURI())
         ->setIsAllDay($event->getIsAllDay())
         ->setIcon($event->getDisplayIcon($viewer))
+        ->setViewerIsInvited($event->getIsUserInvited($viewer->getPHID()))
         ->setIconColor($event->getDisplayIconColor($viewer));
 
       $month_view->addEvent($event_view);