Christmas is not the same as the thanksgiving day, you should know that christmas is something that is being celebrated all over the world.. While thanksgiving is only celebrated on the united states.
This will give you all the answers that you need about how it will "affect" the price.
Thats right. Christmas I think has more impact compared to Thanksgiving and we are seeing the price now. Though the reasons is not sole Christmas as there attacks on bitcoin by some bitcoin forks coins, I can say that it Christmas has impact too.