December 2020
| Day | Date | Celebration | Rank |
|---|---|---|---|
| Day | Date | Celebration | Rank |
| Tuesday | 1 | Weekday of Advent | |
| Wednesday | 2 | Weekday of Advent | |
| Thursday | 3 | St Francis Xavier, Priest | memorial |
| Friday | 4 | Weekday of Advent, St John Damascene, Priest, Doctor of the Church |
|
| Saturday | 5 | Weekday of Advent | |
| Sunday | 6 | 2nd Sunday of Advent | Week II |
| Monday | 7 | St Ambrose, Bishop, Doctor of the Church | memorial |
| Tuesday | 8 | The Immaculate Conception of the Blessed Virgin Mary | solemnity |
| Wednesday | 9 | Weekday of Advent, St Juan Diego Cuahtlatoatzin |
|
| Thursday | 10 | Weekday of Advent, Our Lady of Loreto St John Roberts, Priest, Martyr (W) |
|
| Friday | 11 | Weekday of Advent, St Damasus I, Pope |
|
| Saturday | 12 | Weekday of Advent, Our Lady of Guadalupe |
|
| Sunday | 13 | 3rd Sunday of Advent | Week III |
| Monday | 14 | St John of the Cross, Priest, Doctor of the Church | memorial |
| Tuesday | 15 | Weekday of Advent | |
| Wednesday | 16 | Weekday of Advent | |
| Thursday | 17 | Weekday of Advent | |
| Friday | 18 | Weekday of Advent | |
| Saturday | 19 | Weekday of Advent | |
| Sunday | 20 | 4th Sunday of Advent | Week IV |
| Monday | 21 | Weekday of Advent, St Peter Canisius, Priest, Doctor of the Church |
|
| Tuesday | 22 | Weekday of Advent | |
| Wednesday | 23 | Weekday of Advent, St John of Kanty, Priest |
|
| Thursday | 24 | Weekday of Advent | |
| Friday | 25 | The Nativity of the Lord | solemnity |
| Saturday | 26 | St Stephen, the first Martyr | feast |
| Sunday | 27 | The Holy Family of Jesus, Mary and Joseph | feast |
| Monday | 28 | The Holy Innocents, Martyrs | feast |
| Tuesday | 29 | St Thomas à Becket, Bishop, Martyr (opt. mem. (W) 5th day of Christmas Octave |
feast (E) |
| Wednesday | 30 | 6th day of Christmas Octave | |
| Thursday | 31 | 7th day of Christmas Octave, St Sylvester I, Pope |