The parks are decorated for Xmas right after Halloween (must be done before the first MVMCP), but if I remember correctly, the resorts weren't fully decorated (with gingerbread houses complete, etc.) for another week after Thanksgiving.
I was at the Grand Floridian last Thanksgiving. We arrived the Saturday before Thanksgiving and the gingerbread house was up. The rest of the Xmas decorations in and outside of the resort went up the Wednesday night before Thanksgiving Day.
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