WC is still running the event as you see when you start up ARK. Until that updates, nothing else can be done.
If you dont want the event you have to set to 'no event'. The only option available currently.
I play on PS4. When I start Ark up and I get the front page, the Easter event is not showing, at least not on my console; neither the wallpaper nor text. However, it does state that there is a 2x running at the moment. But as Doagen says, if you set the events option to "no event" (and restart your server, with the killing all would dinos option checked), you'll see no more themed dinos.