Lastinute dinnerparty menu ideas for the night before Thanksgiving

The French love cheesecake. Really. They go nuts over it. My most successful offering to French guests was cheesecake brownies (recipe from David Lebowitz http://www.davidlebovitz.com/2008/10/cheesecake-brownies/) Everyone asked for the recipe. I would do that rather than try to cook something French or, worse, do an American version of a traditional French dish. You do not mess with the classics in France.
Avoid anything spicy....

Is it convenient to grill? Tomorrow evening we're having:
This Flank Steak (without the Texas toast)
http://food52.com/recipes/13349_flank_steak_on_texas_toast_with_chimichurri

(If we couldn't grill, I'd pop the steak under the broiler.)
Broccoli Rabe with a squeeze of Meyer lemon (skipping the pine nuts in light of the Castagnaccio for dessert)
http://food52.com/recipes/3890_broccoli_rabe_with_savory_pine_nuts_and_meyer_lemon

Roasted Potatoes with Garlic and Rosemary (using fresh rosemary), e.g., http://food52.com/recipes/3279_roasted_potatoes_with_garlic_and_rosemary
and
Castagnaccio (Italian Chestnut Cake) http://food52.com/recipes/7470_castagnaccio_italian_chestnut_cake

If I were serving guests, I'd pick up a pint of really good lemon sorbet if I did not have time to make some. If sourcing chestnut flour were an issue, I'd make a pear clafoutis, or perhaps my prune clafoutis: http://food52.com/recipes/14664_winesoaked_prune_flaugnarde_clafoutis I suspect your French guests would really like that.
If you want something to nibble on before serving the meal, make these:
Crispy Parmesan Kale Chips
http://food52.com/recipes/14201_crispy_parmesan_kale_chips
You can turn down the heat and let the potatoes cook at a lower temperature for the few minutes it takes to crisp up the kale.

I'll actually be doing prep for Thanksgiving dinner while making this meal! Have fun. ;o)

At our gathering we always serve mac and cheese or stuffed shells. At the risk of being laughed off the site, the Prince Jumbo Shells recipe is easy and delicious to prepare. there are a number of great mac and cheese recipes on this site, and you can always upgrade by adding lobster pieces to the casserole. The comfort of relatively simple food before the big meal is a nice contrast among our family members. A really great salad and/or green vegetable rounds out the meal.

And, because I can't resist, here are some more if you want to steer clear of Turkey day-type meals: http://food52.com/recipes/search?q=&cat=fall,top_recipes

Here's a great place to start:
http://food52.com/blog/4985_a_lastminute_thanksgiving_menu
Some of these are undoubtedly Thanksgiving fare, but others can easily be repurposed for a late-fall dinner party!