Do you traditionally do a turkey dinner? Get a Tofurkey or a Quorn loaf, and most Thanksgiving side dishes are already vegetarian (vegan is tricker, but try just looking up "(name of dish) + vegan"
Or are you just looking for general ideas? Vegetarian Times places most of their recipes online. I have a subscription to them that I enjoy very much, and I can tell you they have published ideas + recipes for many celebration/seasonal meals
Or do you want actual Bulgarian foods? ( I can't help you there, any more than a search engine could)
let us know which it is, I'll try to remember to come back and check, and maybe I can help more.
