By attending a Christmas Eve service at church on Friday, December 24 or a Christmas Day service at church on Saturday, December 25?
(Seems like caucus rules aren't being enforced, so I dare to post a request for clarification.)
No, we celebrate Christmas differently. In my family, we gather together on Christmas Eve to sing Christmas carols and to read the Biblical accounts of the birth of Jesus.
My wife directs a neighborhood children's choir. All month, they have been singing traditional carols at various functions around the city.
In my ward, we sing Christmas carols in every Sunday meeting during the month of December. The talks in the Sunday meetings have focussed on Jesus Christ and especially His birth.
And of course, the First Presidency broadcasts its annual Christmas Devotional. The talk at the head of this thread is from this year's devotional. The entire devotional, including performances by the Mormon Tabernacle Choir, is available HERE.
Again I wish you a merry Christmas and a prosperous new year!