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
@@ -61,7 +61,7 @@
             => 'PhabricatorCalendarEventCancelController',
           '(?P<action>join|decline|accept)/(?P<id>[1-9]\d*)/'
             => 'PhabricatorCalendarEventJoinController',
-          'comment/(?P<id>[1-9]\d*)/'
+          'comment/(?P<id>[1-9]\d*)/(?:(?P<sequence>\d+)/)?'
             => 'PhabricatorCalendarEventCommentController',
         ),
       ),
diff --git a/src/applications/calendar/controller/PhabricatorCalendarEventCommentController.php b/src/applications/calendar/controller/PhabricatorCalendarEventCommentController.php
--- a/src/applications/calendar/controller/PhabricatorCalendarEventCommentController.php
+++ b/src/applications/calendar/controller/PhabricatorCalendarEventCommentController.php
@@ -11,12 +11,14 @@
   }
 
   public function handleRequest(AphrontRequest $request) {
-    $user = $request->getUser();
-
     if (!$request->isFormPost()) {
       return new Aphront400Response();
     }
 
+    $user = $request->getUser();
+    $is_preview = $request->isPreviewRequest();
+    $draft = PhabricatorDraft::buildFromRequest($request);
+
     $event = id(new PhabricatorCalendarEventQuery())
       ->setViewer($user)
       ->withIDs(array($this->id))
@@ -25,8 +27,23 @@
       return new Aphront404Response();
     }
 
-    $is_preview = $request->isPreviewRequest();
-    $draft = PhabricatorDraft::buildFromRequest($request);
+    $index = $request->getURIData('sequence');
+    if ($index && !$is_preview) {
+      $result = $this->getEventAtIndexForGhostPHID(
+        $user,
+        $event->getPHID(),
+        $index);
+
+      if ($result) {
+        $event = $result;
+      } else {
+        $event = $this->createEventFromGhost(
+          $user,
+          $event,
+          $index);
+        $event->applyViewerTimezone($user);
+      }
+    }
 
     $view_uri = '/'.$event->getMonogram();
 
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
@@ -16,9 +16,10 @@
   public function processRequest() {
     $request = $this->getRequest();
     $viewer = $request->getUser();
-
     $sequence = $request->getURIData('sequence');
 
+    $timeline = null;
+
     $event = id(new PhabricatorCalendarEventQuery())
       ->setViewer($viewer)
       ->withIDs(array($this->id))
@@ -60,9 +61,11 @@
       $crumbs->addTextCrumb($title, '/E'.$event->getID());
     }
 
-    $timeline = $this->buildTransactionTimeline(
-      $event,
-      new PhabricatorCalendarEventTransactionQuery());
+    if (!$event->getIsGhostEvent()) {
+      $timeline = $this->buildTransactionTimeline(
+        $event,
+        new PhabricatorCalendarEventTransactionQuery());
+    }
 
     $header = $this->buildHeaderView($event);
     $actions = $this->buildActionView($event);
@@ -78,13 +81,19 @@
       ? pht('Add Comment')
       : pht('Add To Plate');
     $draft = PhabricatorDraft::newFromUserAndKey($viewer, $event->getPHID());
+    if ($sequence) {
+      $comment_uri = $this->getApplicationURI(
+          '/event/comment/'.$event->getID().'/'.$sequence.'/');
+    } else {
+      $comment_uri = $this->getApplicationURI(
+          '/event/comment/'.$event->getID().'/');
+    }
     $add_comment_form = id(new PhabricatorApplicationTransactionCommentView())
       ->setUser($viewer)
       ->setObjectPHID($event->getPHID())
       ->setDraft($draft)
       ->setHeaderText($add_comment_header)
-      ->setAction(
-        $this->getApplicationURI('/event/comment/'.$event->getID().'/'))
+      ->setAction($comment_uri)
       ->setSubmitButtonName(pht('Add Comment'));
 
     return $this->buildApplicationPage(