Christmas Eve has always been at my in-laws house. There's a big spread of food that includes six racks of spareribs that I have been smoking up for the occasion since my wife and I got married 23 years ago. We go caroling through the neighborhood as a group, then back to the house to eat and drink a bit more. Once the guests (non-family) have departed, the family opens presents.
Christmas morning has always been at our house, and my sister brings her ridiculously good coffee cake, which we serve alongside a mountain of scrambled eggs and some homemade bacon and sausage. Then we all open gifts to help ease the food coma. As soon as gifts are done, I start preparation of the standing rib roast (a tradition I took over from my dad about 11 years ago), and then we usually go for a family hike in the afternoon (weather permitting) before the whole family descends on our place for dinner (anywhere from 12-20 people.)
Obviously, this year will be quite different, but we look forward to restarting next year.
My parents tradition when I was a kid was their annual Xmas ornament exchange party. Everyone who came to the party brought a home-made ornament with them. Each ornament was given a tag with a number, and a similar tag when into "the hat". After lots of time to feast on the spread my mom put out, we would gather everyone in the living room to sing Christmas carols (mom played the piano.) After carols, we would draw numbers out of a hat, starting with the youngest person in the room all the way through to the oldest to see who got which ornaments. There were always a few coveted ornaments that someone made every year (wood soldiers, balsa wood angels, stained glass, etc) by some very talented friends. ....other ornaments were, um, less sophisticated!

I've always wanted to start that tradition back up again, but just haven't gotten off my duff to do it. It's a fun one, though!
R