As far as I know, the only Christmas decoration etiquette is the 12 days of Christmas business (i.e. if they're still up past 6th Jan or whenever is 12 days after 25th Dec, you have to keep them up all year or its bad luck). Still, if you don't believe in luck then there's nothing to worry about!
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My Xmas tree came down yesterday as the kitten was trying to eat the tinsel.