Delete registrant if recreating all instances

modules/recurring_events_registration/recurring_events_registration.module

@@ -168,6 +168,7 @@ function recurring_events_registration_recurring_events_save_pre_instances_delet
   // Send an email to all registrants.
   foreach ($registrants as $registrant) {
     recurring_events_registration_send_notification($key, $registrant);
+    $registrant->delete();
   }
 }