The Feast of the Epiphany, which commemorates the visit of the Magi to Bethlehem -- no, they didn't show up on the night of the birth of Jesus to share the spotlight with the shepherds, but I won't go into all that -- is traditionally on January 6. Now many churches celebrate it on a Sunday in order to give it more prominence in a secularized world in which few people are likely to show up for worship on a weekday/workday.
Among the more unusual customs of the day, in Manitou Springs, Colorado, Epiphany is marked by the Great Fruitcake Toss. Fruitcakes
are thrown, participants dress as kings, fools, etc., and competitions
are held for the farthest throw, the most creative projectile device,
etc. As with customs in other countries, the fruitcake toss is a sort of
festive symbolic leave-taking of the Christmas holidays until next
year, but with humorous twist, since fruitcake (although the traditional
Christmas bread of America, England and other English speaking nations)
is considered in the United States with a certain degree of derision,
and is the source of many jokes.