diff --git a/src/applications/calendar/phid/PhabricatorCalendarEventPHIDType.php b/src/applications/calendar/phid/PhabricatorCalendarEventPHIDType.php
--- a/src/applications/calendar/phid/PhabricatorCalendarEventPHIDType.php
+++ b/src/applications/calendar/phid/PhabricatorCalendarEventPHIDType.php
@@ -38,4 +38,32 @@
     }
   }
 
+  public function canLoadNamedObject($name) {
+    return preg_match('/^E[1-9]\d*$/i', $name);
+  }
+
+  public function loadNamedObjects(
+    PhabricatorObjectQuery $query,
+    array $names) {
+
+    $id_map = array();
+    foreach ($names as $name) {
+      $id = (int)substr($name, 1);
+      $id_map[$id][] = $name;
+    }
+
+    $objects = id(new PhabricatorCalendarEventQuery())
+      ->setViewer($query->getViewer())
+      ->withIDs(array_keys($id_map))
+      ->execute();
+
+    $results = array();
+    foreach ($objects as $id => $object) {
+      foreach (idx($id_map, $id, array()) as $name) {
+        $results[$name] = $object;
+      }
+    }
+
+    return $results;
+  }
 }
diff --git a/src/applications/differential/phid/DifferentialRevisionPHIDType.php b/src/applications/differential/phid/DifferentialRevisionPHIDType.php
--- a/src/applications/differential/phid/DifferentialRevisionPHIDType.php
+++ b/src/applications/differential/phid/DifferentialRevisionPHIDType.php
@@ -47,7 +47,7 @@
   }
 
   public function canLoadNamedObject($name) {
-    return preg_match('/^D\d*[1-9]\d*$/i', $name);
+    return preg_match('/^D[1-9]\d*$/i', $name);
   }
 
   public function loadNamedObjects(