customer design improvement

customerapi/models/registrations/EventRegistrationAvailable.php

@@ -18,6 +18,7 @@ class EventRegistrationAvailable extends EventRegistration
             "created_at" => "created_at",
             "updated_at" => "updated_at",
             "deleted_at" => "deleted_at",
+            "canceled_at" => "canceled_at",
         ];
         $fields['event'] = 'event';
         return $fields;