I'll be working from home on Christmas eve, so after I finish (around 3pm, I hope) I'll be putting up the tree and decorate it. While trying the keep the cats from chewing through the cables for the lights.
I'll have a nice selection of cheeses, crackers and chutneys and pickles, so dinner will be lots of nibbles, followed by lots of home-made christmas biscuits for dessert nibbles. Haven't decided yet if I should buy a bottle of wine, or just craft beers, but leaning towards the beers right now.
I expect my mom will call us at some point from Germany, and I'll have to nag the OH into ringing his own parents, too. Then it's just relaxing in front of the fire arguing about what to watch on telly.
Christmas day will be a long lie-in, followed by brunch and pressies. If the weather is ok, a long walk on a beach somewhere. I'll spend the afternoon making dinner (lentil and nut loaf with cranberries, stuffing, roasties, spiced red cabbage, honey-roasted carrots, fried sprouts with orange, lebkuchen gravy). And then we'll spend most of the evening digesting...