Menu for pre-Thanksgiving dinner party?

I realize I'm coming to this party a bit late, but:

I would serve Beef Burgundy or this pot roast https://food52.com/recipes/19471-fennel-and-onion-braised-pot-roast-with-carrots with noodles. People love good old-fashioned egg noodles (lightly butter them), especially when served with comfort food like beef stew or pot roast. Both can and are indeed better when made the day before. I'd serve Merrill's Brussels sprouts with pancetta and croutons, or just a simple salad with April Bloomfield's lemon and caper dressing (Genius recipe) and end with a pear galette https://food52.com/recipes/14452-rustic-pear-tart-with-walnut-streusel-topping topped with maple whipped cream.
Let us know what you end up doing, please. ;o)

If you are looking for a warm winter dish in total contrast to Thanksgiving and a little lighter, I recommend this Brazilian salmon stew: https://food52.com/recipes/4574-salmon-moqueca
It's a warm and hearty stew but the flavors are bright and light. Also, you won't have to cook for days and you just need one big pot. I serve it over either brown rice or spaghetti squash. I made a double recipe for company once, thinking to have freezable left-overs, and they licked the pot clean...
I'd probably serve a light fennel and greens salad as a starter and maybe a pear tart or cake for dessert.

I love the idea of a comforting hearty soup as the main course. I love this one for fall, it is a bit different but still has the sweet potato and kale to keep with some traditional flavors: http://ediblecleveland.com/recipes/african-peanut-stew
Also goes great with champagne, to echo the sage advice above.

We also published this article last week that argues for Chinese food and Champagne—take a look, it might be a fun thing to try! It's what I'll be doing :) https://food52.com/blog/14858-the-argument-for-drinking-champagne-with-takeout

I'm in the same boat! I'm making a pretty simple dinner of fresh pasta with a light tomato sauce (enriched by almonds) and a bitter greens salad. For snack, I'm just doing an assortment of Spanish tapas (bits of chorizo, some tinned razor clams and smoked mussels, bread). I figure the handmade pasta makes it feel festive, but all the other prep is super easy and pretty light. Have a great dinner!

From the guests' POV, avoid the usual suspects, to make a contrast to Turkey Day.
From the hostess POV, make something you know well or they know well...to increase the ease and comfort of the evening.
If you don't have some main dish pop immediately to mind, think of something you can do as a main-plus-toppings everyone can choose according to taste, like chili, curry or a taco bar.
Or a simple meal of soup, baked pasta dish and a fruit dessert.