An even more ancient tradition has the final day of the Christmas Season as February 2nd, Candlemas (or Candle Mass). This is the recognition of Mary fulfilling the Jewish requirement of purification (not that she "needed" it) and in the readings for Mass this day is the last mentioning of the Christ Mass for this liturgical year - Christmas is over.
So, continue to celebrate the Christ Mass! Raise a few eye-brows and wish someone a "Merry Christmas" and when they try to correct you - you have an opportunity to gently correct them and remind them that Advent ended on December 24th, Christmas just began on that day!
And, as our on-going campaign states... "The best way to keep Christ in Christmas is to keep Mass in Christmas!" Please share this page and/or the memes below - and MERRY CHRISTMAS!