I've been a vegetarian for many years. When I got the Celiac diagnosis, the only real change to my holiday fare was to exclude Tofurkey, which many omnivores think is a terrible idea anyway, and modify my other recipes. Lots of people are thinking about this right now, so I'm sharing my menu and some other ideas that might inspire you. Plenty of recipes live on-line that you can search and find. If I've got a good one, I'll share the link. If you've got one, share it with me and I'll tell everyone else!
Baked acorn squash, stuffed with rice lentil pilaf with chopped nuts, dates and bits of tofu
GF green bean casserole
Oven roasted root vegetables
Cranberry sauce (homemade by my co-worker TL)
Store-bought GF rolls, warmed in the oven
Impossibly Easy Sweet Potato Pie
Apple crisp (crisp part made with GF flour)
My family will be eating Tofurkey with gravy and Pillsbury crescent rolls, but otherwise, we're all eating the same thing. The most important thing is to stay healthy, enjoy the company, and be thankful!