I'm the most Kkkrackkkers of Amerikkkans so my tradition is just getting drunk off mulled wine and re-watching bad holiday movies with relatives I only kinda like.
I'm sometimes a little jealous of people who have weirder shit going on, like gremlins who slam doors and steal sausages or shitting Christmas logs. We need to bring back weird ass half-pagan shit.
We have two Christmas Days, on December 25 and 26. For people in relationships that usually means one day celebrating with your parents, and the other with your inlaws. Lately a lot of people have started observing an unofficial third Christmas Day on the 27th to celebrate with friends.