Santa is not welcome!

I've had the habit of disabling his section of the tradition through the calendar, you can always substitue it with a Christmas party tradition instead, when mixed in with the gift giving/receiving you can get the same overall Holiday without a random old man bursting down your door at 11pm.

Best to delete him from manage worlds too after if you don't want him calling children he's already met previously on a Monday night asking if he should befriend someone's dead cat.