@RobinCorte,I'm sorry to tell you, but when we get these events late, the only thing we get are the prizes of the day. I also received this event today. But unfortunately we won't receive the costumes. This has happened to me before.
@RobinCorte clearly there is a bug in the game if it finally gave you an event. Force close the app, clear the cache, restart your device and it should go away.