All of the Christmas decorations and activities will definitely be up and going by Thanksgiving. The EP storytellers and Candlelight Processional don't start until the day after Thanksgiving, so you would be safe for everything else to be completed by then. However, the tree won't be up in MK until after the parade taping which usually takes place the first weekend in Dec. The week of Dec 11 would have everything, including the tree, in place.