my freind your question is far to vague... But to answere it anyway i would try and stay away from tradition xmas day foods as people are going to be getting enough of that. Offer something different as it will more than likely be treasured round about this time of year. But in reality you need to ask your guest, get a basic idea then get creative. Just imagine if every restaurant owner/chef could speak to their diners before they served them, every1 should be satisfied every time.
all in all have chat with your guest and see whats what? it might turn out that you have a few veggies in the group ect...
then start planning.
hope that helps