I can't find the original calendar on Google. Was bunny day and spooky day a thing, or am I imagining it? I swear they were default holidays. I just deleted them and they never popped back up again. ...
The bunny holiday is not by default. I've never had it in my game. I don't really want to do Easter without actual religious gameplay. Spooky day I tend to create; it is not by default either.