December 21. Feast Day of Saint Peter Canisius.

December 23. Fourth Sunday of Advent.

December 24. Christmas Eve.

December 25. The Nativity of Our Lord.

December 26. Feast Day of Saint Stephen.

December 27. Feast Day of Saint John.

December 28. Feast Day of the Holy Innocents. 

December 29. Fifth Day, Octave of Christmas.

December 29. Feast Day of Saint Thomas Becket.

December 30. Feast Day of The Holy Family.

December 31. Seventh Day, Octave of Christmas, New Years Eve.

December 31. Feast Day of Pope Saint Sylvester I.