Stuffing! Have to have stuffing! If we have Thanksgiving at my ILs, I offer to bring it because I don't like hers! lol! It freezes well, too!
You can freeze mashed potatoes, pies, turkey (make now, cut, freeze in freezer bags, defrost, and heat!)
You can make ahead rolls and freeze.
Lots of vegetable casseroles (if you do them) freeze well.