How about an Asian-style noodle bar? Pick a couple types of noodles, a couple types of broth, and some toppings. After the noodles are cooked, you can probably "hold" them in a warm water bath. Keep the broth hot in a crockpot or on the stove.
Noodles:
Shirataki
Udon
Rice noodle
Buckwheat soba
Broth:
Chicken
Beef
Veggie
(Whatever broth you pick, infuse it with Asian-y seasonings like ginger, star anise, onion, mushroom, etc… you can make pho broth if you want to)
Toppings:
Shredded omelet
Scallions
Peanuts
Soy sauce
Sriracha
Pickled ginger
Thai basil
Bean sprouts
Chilis
Cilantro
Mint
You could also have some very simply cooked veggies (carrots, celery, onion, mushroom, broccoli) and/or protein (chicken, beef, tofu) for people to stir in.
A big bowl of that would be nice, I think. It's filling enough to satisfy but lighter than the Thanksgiving fare.