Answer :

Although it may have originated from the mediaeval belief that decorations left up after Candlemas eve would become possessed by goblins of Christmas.

Why keep the holiday decorations up?

It seems sense that leaving your holiday decorations up could have the same impact because, according to experts, putting them up early may make you happier. Who wouldn't want it, though? Others believe that the Christmas mess ought to be cleared away as soon as the final gift is received the custom that it is unlucky to keep decorations up after Twelfth Night and the Epiphany is a contemporary fabrication.

Is leaving Christmas decorations up unlucky?

The notion that putting Christmas decorations up through the Epiphany on January 6 is not unlucky.

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