She is much loved by the Mexican people, especially indigenous Mexicans, and in the Southwestern part of the United States.
December 13: St. Lucy/Lucia. An Italian saint dearly loved by Scandinavians. It's customary to make St. Lucia buns on this day. YUM! :) St. Lucy was a roman martyr who brought food to the people imprisoned in the catacombs, wearing a crown interspersed with candles to light her way down the dark passageways.
December 14: St. John of the Cross, Carmelite.
December 17: The O Antiphons start. You probably know these as the verses to "O Come, O Come Emmanuel".
December 25: Christmas Day--start of the Christmas season. Immediately after Christmas, we have a few great feasts, so I'll put them in here.
December 26: Feast of St. Stephen, the first martyr
December 27: Feast of St. John, the "disciple whom Jesus loved", apostle, and writer of the Gospel of John and the Book of Revelation. He is the only apostle to have died a natural death.
December 28: Feast of the Holy Innocents--the babies Herod the King killed as he tried to find the "newborn king of the Jews". The Coventry Carol memorializes this event, as well.
December 29: Thomas Becket, bishop and martyr; born in London in 1118, he became chancellor to the King of England, but was exiled by Henry II, in response to his defense of the rights of the church against the state. After returning to England, he was murdered in 1170 in Canterbury Cathedral, (site of the pilgrims' destination in The Canterbury Tales, by the way.)
Sunday After Christmas: The Feast of the Holy Family--Mary, Jesus, and Joseph.
January 1: Solemnity of Mary, Mother of God, and a Holy Day of Obligation in the United States.