November 8 is probably is the date for the theme parks.
The official Fort decorations have not gone up until Wednesday night of Thanksgiving week for the past two years.
Campers will have there decorations up long before the official ones. Everything is still in full swing up to New Year's Eve. Then, stuff will slowly come down. I would expect that Jan. 2nd will be a big day for folks to take down decorations, and I have seen the Fort's official decorations taken down on the night of Jan. 2nd one year (they were taken down later last year) but plenty will still be around over the next few days.
TCD