Gobble, Gobble, Gobble

So, as Thanksgiving approaches, I wonder about the appropriateness of holidays in the classroom. How do we remain culturally sensitive and include all families? I have been taught that it is best practice to exclude holidays from the center, unless teaching in a faith based program. I still believe that- except when it comes to Thanksgiving and Fourth of July. I think that they are the all American holidays and should be celebrated everywhere as part of a citizenship and morality curriculum. Thoughts?