MK will be fully decorated by the second week of Nov. (that's when the first MVMCP happens.)
The rest of the parks and resorts and DS/DTD will be in process of being decorated (some earlier than others)
up until Friday, the day after Thanksgiving, at which time everything will be in full holiday mode.
It's interesting (and sad) to note that, other than MK, the parks are not nearly as "decorated" as they once were.
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