I guess you’re right, but it wouldn’t be a proper Thanksgiving, right?
We have actually a simmilar tradition in terms of food. I mean we also eat poultry (goose to be precise), but we celebrate St. Martin’s arrival - according to a legend, he was the one who gave a beggar his royal robe and came to him on a white horse on a first day it snowed.
He is a patron of goose as well. And i think it has something to do with goose with it’s fatty meat is a good one to eat before big fast before Christmas.
Something like that. Also a good reason our families gathers.