I always had a family Christmas with my parents and extended family when growing up. When my DC came along they just joined in with that. They were with their parents and grandparents, a couple of aunties. Everyone was nice to them, they got presents, we played games and had nice food. They were in a house they knew well as we visited very frequently throughout the year. With people who loved them and included them. No drama. What's not to like? They just accepted this is how Christmas is.
When my parents and a couple of older family members died, DC were adults - late teens / early 20s - living away, but always came home to me for Christmas. No pressure, no expectation. It's just what they did and new traditions were formed relating to food, games, walks and some family in jokes. All helped with the cooking and tidying up, no time pressure. Dinner was served when it was ready which may be12 o'clock or 3 o'clock. Then presents and board games. Lots of chat and laughter.
One year, one DC spent Christmas with their then partner and was surprised that alcohol played such a big part in their Christmas.They weren't impressed with that but did ask why we never had starters. Another year, and with a different partner, they were surprised at the formality of Christmas dinner and commented that it was like eating in a restaurant. Ours is very much help yourself to whatever, and how much, you want and go back for seconds and thirds if you want. And eat your dessert, or another dessert, later if you' wish.
DC are now in their early 30s with serious partners but still come home for Christmas day whilst their partners go to their own family. Partners would be very welcome but this works for them for now.
For me it's about being relaxed; welcoming without any pressure. Not sweating the small stuff. The structure of our Christmas is based around tradition so never feels time timetabled but we all know roughly what's going to happen and when (within an hour or three). And we don't do drama.