When I was a little girl we went to WDW for Thanksgiving (I think it was 1975). This was back in the "olden days" before all of the fancy dining options were available. We had so much fun having "Thanksgiving Hot-Dogs" and being thankful for being at the MK with our family!
It is one of my best memories.
We had a "real" Thanksgiving dinner with my Grandparents the weekend after we came back.
I know this doesn't answer your question, but I wanted to share the memory and put the idea out there that Thanksgiving dinner can mean a lot of different things.... A non-traditional holiday can create its own special memories.