The month of December is dedicated to the Immaculate Conception, which is celebrated on December 8. The first 24 days of December fall during the liturgical season known as Advent and are represented by the liturgical color purple. The remaining days of December mark the beginning of the Christmas season. The liturgical color changes to white or gold — a symbol of joy, purity and innocence.
The feasts on the General Roman Calendar celebrated during the month of December are:
3. Francis Xavier, Memorial
4. Second Sunday of Advent, Sunday
6. Nicholas, Opt. Mem.
7. Ambrose, Memorial
8. Immaculate Conception, Solemnity
9. Juan Diego (USA), Opt. Mem.
11. Third Sunday of Advent, Sunday
12. Our Lady of Guadalupe (USA), Feast
13. Lucy, Memorial
14. John of the Cross, Memorial
18. Fourth Sunday of Advent, Sunday
21. Peter Canisius, Opt. Mem.
23. John of Kanty, Opt. Mem.
24. Christmas Eve, Sunday
25. Christmas, Solemnity
26. Stephen, Feast
27. John, Feast
28. Holy Innocents, Feast
29. Thomas Becket, Opt. Mem.
30. Holy Family, Feast
31. Sylvester I, Opt. Mem.