That is the feast of epiphany (and when I take them down), but the season of christmastide continues. (Note I've also seen some who opt for the commemoration of the Baptism, which is the week after epiphany)I'm not a practicing Christian, but I believe the correct answer to OP's question is 12 days after Christmas.
"The 12 days of Christmas is the period in Christian theology that marks the span between the birth of Christ and the coming of the Magi, the three wise men. It begins on December 25 (Christmas) and runs through January 6 (the Epiphany, sometimes also called Three Kings’ Day)."
so pick your tradition and go with it.
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