Topsy's popcorn from Kansas City! (A tradition that went back to my parents' childhoods in Kansas City - a canister of Topsy's caramel/cheese/cinnamo n popcorn was the SIGNAL that the holidays were in full swing!)
The entire family decorates the house and tree.
Dad cusses while untangling light cords as my Mother directs him to put them up (my Dad let my ex-husband do it one year ... my ex didn't speak to my Father for three days after being 'helped' by my Mother).
The man of the family puts the star on the tree (my Father while living in FL, my ex while living in MT).
Backaches from sitting on the floor to wrap presents.
Adding more glitter paint to the stockings (my brother's tradition).
Mini-stockings for the pets (you haven't lived until you can fit the name 'Voldemort' onto a mini-stocking cuff).
'A Charlie Brown Christmas' and 'How the Grinch Stole Christmas'.
Britcom Christmas specials (my Dad, ex, and myself).
Putting up ALL the cards from previous years (I never liked this tradition, as the numbers are now astronomical).
Walk the neighborhood to look at the neighbors' light displays (again, you haven't lived until you see light-wrapped palm trees and plastic flamingos wearing Santa hats).
Peppermint ice cream.
Baking cookies, making peppermint bark, etc.
One present opened on Christmas Eve.
When my Mother worked nights as an RN, she would come home on Christmas morning and fill the stockings, then announce that we were ready to open presents.
Present-opening was from youngest to oldest, one at a time, so we can appreciate what we got and thank the person who gifted it.
Pancake breakfast, followed by dinner prep.
Traditions I had with my ex while living in Montana -
The Britcoms, as mentioned.
Cutting our own tree in the national park. ($5 permit was better than shelling out $100 at the tree-stand.)
Presents from fictional characters. (I once got a Boris V. calendar from John Carter and Dejah Thoris.)
Watching the town Christmas parade.
(Sorry for the 'text wall'.)