Since I got married, also in 1966, I have probably done about 45 Christmases. The exceptions were one or two before we had children, when we lived abroad and I think we've had three at AC's homes. Usually we have a houseful. This year only 11 but there have been 17 sitting down for Xmas dinner.
Hardly any two folk in our family have the same diet. We do have omnivores, but even they might disagree about how they want the turkey done. Then we have those who eat fish but not meat, the vegetarians and the vegans. There are some with serious allergies - dairy, eggs and sesame and others who have to be gluten free. Fortunately I do like cooking and the others will wash up.
One of the traditions has always been Xmas pudding. I make a vegan, gluten free version which contains money, dowse it in brandy or whisky and set fire to it. This year I told them on Xmas Eve that I was about to make the pudding and one DGD said she didn't like it, several others agreed. I said it was a tradition but they seemed happy to let it go so we did not have any Xmas pudding!!!
We did have chocolate mousse, sherry trifle, fruit salad, vegan ice cream and mince pies. No-one seemed to miss the pudding. So much for tradition.