Where can one find a traditional Thanksgiving Dinner in Wroclaw?
You'd have to make it from scratch yourself, or get invited to an American home that's keeping up the tradition. Fortunately, all of the ingredients are available in larger cities in Poland. Even sweet potatoes. European cranberries are a lot smaller than American ones, but the taste is the same. Actually, it's easier to find good pie pumpkins in Poland than in the States. The biggest problem is trying to fit a large turkey into a small European oven. Did it once when I was studying in Germany, but it was a very tight fit.
Another problem you'll run into is that most Poles detest the taste of sage. With an unquenchable passion. So if you're having Polish guests over, leave out the sage. They have no problem with the rest of the foods, though. They might think pumpkin pie and sweet potatoes with maple syrup sounds strange, but they love them once they taste them.
This year, I'm roasting a whole turkey (in my friend's professional kitchen) with chestnut stuffing, and serving it with New England clam chowder, Waldorf salad, homemade cranberry sauce, sweet potatoes with maple syrup and REAL AMERICAN black walnuts (by chance, there is a REAL AMERICAN black walnut tree growing near where I live; how it got here is anyone's guess), succotash, corn on the cob, mashed potatoes (actually the hardest to make, because good potatoes are a real beech to find, at least here in Wrocław; I have to order the variety called "Bryza"; the regular varieties are extremely bland and watery to the point that they're inedible), sweet yellow Yankee cornbread with lots of butter, cream and eggs, pumpkin pie, baked apples a la mode, apple cider (there is a Polish product that is similar to the American one; takes connections, but it can be done) and eggnog.