Epiphany - January 6

In the Episcopal Church  the coming of the Magi and the manifestation of Christ to the peoples of the earth and is celebrated on the Feast of the Epiphany, January. 6.  Early Christians chose this day, which was a pagan solstice festival day, to celebrate the various manifestations, or "epiphanies," of Jesus' divinity. These showings of his divinity included his birth, the coming of the Magi, his baptism, and the Wedding at Cana where he miraculously changed water into wine. The day was called "The Feast of Lights, " and celebration of the Son of God replaced celebration of the sun. Baptisms were done, and a season of preparation was instituted. By the fourth century. Jesus' birth was celebrated on December 25th in both eastern and western churches. 

                                                                                                         from "An Episcopal Dictionary of the Church, A User Friendly Reference for Episcopalians," Don S. Armentrout and Robert Boak Slocum, editors.

Advent - December 1 - December 24

Advent is the first season of the church year, beginning with the fourth Sunday before Christmas and continuing through the day before Christmas. The name is derived from a Latin word for "coming." The season is a time of preparation and expectation for the coming celebration of our Lord's nativity, and for the final coming of Christ "in power and glory."
                                                                                                         from "An Episcopal Dictionary of the Church, A User Friendly Reference for Episcopalians," Don S. Armentrout and Robert Boak Slocum, editors.

Christmas Season - December 25 - January 5

Christmas (in old English, Cristes maesse) is a festival celebrated on Dec. 25, commemorating the Incarnation of the Word of God in the birth of Jesus Christ. In the Episcopal Book of Common Prayer it is also called The Nativity of Our Lord Jesus Christ. In the United States it is also a popular secular holiday and is one of the seven principal feasts. The Christmas season lasts twelve days, from Christmas Day until Jan. 5, the day before the Epiphany. The season includes Christmas Day, the First Sunday after Christmas Day, the Holy Name of Our Lord Jesus Christ, and may include the Second Sunday after Christmas Day. In many parishes, the main liturgical celebrations of Christmas take place on Christmas Eve. 
                                                                                                         from "An Episcopal Dictionary of the Church, A User Friendly Reference for Episcopalians," Don S. Armentrout and Robert Boak Slocum, editors.