diff --git a/src/applications/calendar/xaction/PhabricatorCalendarEventInviteTransaction.php b/src/applications/calendar/xaction/PhabricatorCalendarEventInviteTransaction.php
--- a/src/applications/calendar/xaction/PhabricatorCalendarEventInviteTransaction.php
+++ b/src/applications/calendar/xaction/PhabricatorCalendarEventInviteTransaction.php
@@ -179,6 +179,14 @@
     $old = $this->getOldValue();
     $new = $this->getNewValue();
 
+    // $old has this handled in `generateOldValue`.
+    $status_uninvited = PhabricatorCalendarEventInvitee::STATUS_UNINVITED;
+    foreach ($new as $key => $status) {
+      if ($status == $status_uninvited) {
+        unset($new[$key]);
+      }
+    }
+
     $add = array_diff_key($new, $old);
     $rem = array_diff_key($old, $new);