There's the book Claudia and the First Thanksgiving. I don't remember if there was an actual dinner, but the book was about Thanksgiving. There was one book (might have been this one) that mentioned the families eating together.
What about Stacey McGill, Matchmaker? Didn't they invite the guy Stacey was trying to hook her mom up with over for Thanksgiving? Or was that a different holiday? I can't remember for sure.
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I forgot about Claudia and the First Thanksgiving. I'll have to check out Stacey McGill, Matchmaker to check out if there's Thanksgiving in the book. And now, I remember that the Kishi family celebrates Thanksgiving in Claudia and the Friendship Feud.