January 6th marks the beginning of Epiphany in the Liturgical Year. Advent marks the beginning of the Liturgical year and starts on the 4th Sunday before Christmas. Christmas day marks the beginning of Christmastide or the 12 days of Christmas which concludes January 5th. Epiphany lasts until Ash Wednesday. This is the way I've learned it but if you click on The Epiphany Season to find a more complete discussion and the many variations that exist.
Usually on Epiphany we look to how Christ is revealing himself in our lives. I know for me Christ is being revealed through all of you, but I would be interested to hear what others say. So pull up a chair, grab your favorite beverage and a piece of King Cake and share how He is being revealed in your life.