I don't know if these are "traditions", really, but we used to do the same thing every single year.
On Christmas eve night my family went out driving around to look at all people's decorations. When we got home my mom would read us The Night Before Christmas, and my brother and I would each get to open one present, which was always pajamas. The next morning we would gather around and open presents. Then we spent the rest of the day eating and playing with our new stuff.
Now my parents can't be bothered to go out to look at lights. And my mom doesn't read us that story anymore (lol I'm such a kid pouting about this). But we still get our PJ's and Christmas day is still the same, my parents still buy WAY too much stuff.
I will probably spend Christmas eve/Christmas morning at my parents house until I have my own kids and then we will do Christmas at our house and my parents will probably come there. Idk what they'll do when/if my brother and I both have kids! Probably they'll come to my house, my grandma always did because my brother and I were the oldest, but all my mom's siblings live all over the country so it's not like she can do Christmas morning somewhere and Christmas dinner somewhere.
We do Christmas pretty hardcore. My dad puts lights ALL over the roof and dormers and porch and everything, my mom brings out all 900 of her decorations and we put them all inside. I usually bake at least 10 batches of different cookies (we put the dough in the snow to chill it because it won't all fit in the fridge). I wrap everything really neatly with ribbons and bows and stuff. I love Christmas.
Zach is Jewish...at his house there's a "Hanukkah Bowl". Everyone writes something they want on a piece of paper, folds in half, and puts their name on the outside. Then when you go shopping, you just grab a paper or two for each person. That way, everyone gets something they want but it's still a surprise. We plan on doing this for our kids.
I get incredibly excited thinking about celebrating two holidays with our children, as if my parent's SuperChristmas isn't enough.