Date	Novus Ordo		Traditional (1962 Calendar)
Sunday December 20, 2009	Fourth Sunday of Advent	Propers	Fourth Sunday of Advent O Clavis David (O Key of David)	Propers	Martyrs Breviary	Instruction on the holy sacrament of Penance
Monday December 21, 2009	Monday of the Fourth Week of Advent Optional: Saint Peter Canisius, priest and doctor of the Church	Propers	St. Thomas, Apostle Comm: Feria O Oriens (O Radiant Dawn)	Propers	Martyrs Breviary
Tuesday December 22, 2009	Tuesday of the Fourth Week of Advent	Propers	Greater Feria of Advent O Rex Géntium (O King of the Nations)	Propers	Martyrs Breviary
Wednesday December 23, 2009	Wednesday of the Fourth Week of Advent Optional: Saint John of Kanty, priest	Propers	Greater Feria of Advent O Emmánuel	Propers	Martyrs Breviary
Thursday December 24, 2009	Thursday of the Fourth Week of Advent Vigil Mass for Christmas	Morning Vigil	Vigil of the Nativity of Our Lord [Fast and Abstinence]	Propers	Martyrs Breviary
Friday December 25, 2009	The Nativity of the Lord (Christmas) [Holy Day of Obligation]	Midnight Dawn Day	The Nativity of Our Lord [Holy Day of Obligation] Comm (at dawn): St. Anastasia	Midnight Dawn Day	Martyrs Breviary
Saturday December 26, 2009	Feast of Saint Stephen, first martyr	Propers	St. Stephen, Deacon & Protomartyr Comm: Day in the Octave of Christmas	Propers	Martyrs Breviary
Sunday December 27, 2009	Feast of the Holy Family of Jesus, Mary, and Joseph	Propers	Sunday in the Octave of Christmas Comm: St. John, Apostle & Evangelist	Propers	Martyrs Breviary	Instruction on blessing