RL growing up it was always day after Thanksgiving we'd go and get the tree, bring it home, and get it set up and decorated. Then Sat/Sun we'd do the outdoor stuff.
For the game I only started playing back in July so I don't have any Christmas stuff to put out yet, but if I did I'd go with either the day the Christmas event starts or the day we get snow in our towns, whichever of those happens first.
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