Not sure what our plans are this year (or if I'm cooking) but some things my family has made for either Thanksgiving or Xmas that feel hearty and festive:
-root bake (potatoes, carrots, turnips, squash, fennel, mushrooms (really whatever veggies are handy), with a TON of rosemary, thyme, sage, etc)
-pilafi (greek pilaf rice-- stirfry some noodles in butter til they brown, add rice, add veggie stock)
-biscuits with maple or apple butter
-baked acorn squash halves with butter and maple syrup
-sage stuffing with walnuts, celery and carrots
-garlic mashed potatoes
We've never felt the need to have a stand-in for turkey. If I'm having Thanksgiving with my mom or sister who are also veg, we just enjoy making a bunch of side dishes! Although this year I might treat us to a Field Roast because their other products are so delicious and I've never tried the loaf.