List of movable Western Christian observances

This is a list of movable observances within Western Christianity. It includes secular observances which are calculated by religious observances.
This list does not necessarily imply either official status nor general observance.
First Sunday of the year, unless the Sunday falls on January 1, 6, or 7, then January 2: January 5
First Monday: January 6
Monday after January 6: January 12
Sunday following January 6: January 12
Day after Plough Sunday: January 13
Third Sunday: January 19
9th Sunday before Easter in Western Christianity: February 9
2nd Sunday before Ash Wednesday (Western Christianity): February 16
Last Thursday before Lent (Western Christianity): February 20
Saturday before Ash Wednesday: February 22
Sunday before Ash Wednesday (Western Christianity): February 23
Monday before Ash Wednesday: February 24
Tuesday before Ash Wednesday: February 25
46 days before Easter: February 26
Friday after Ash Wednesday: February 28
First Sunday of Lent: March 1
March 19, unless the 19th is a Sunday, then March 20: March 19
Fourth Sunday of Lent, 21 days before Easter Sunday: March 22
Fifth Sunday of Lent: March 29
Week before Easter:
Second Friday of April: April 10
Easter Week: April 12-18
Sunday after Easter: April 19
Third Sunday after Easter: May 3
Monday and Tuesday in the week following the third Sunday of Easter: May 4–5
Fourth Sunday after Easter: May 10
Fourth Friday after Easter: May 15
Third Sunday of May:
Sunday preceding the Rogation days: May 17
Monday, Tuesday, and Wednesday preceding Feast of the Ascension: May 18–20
39 days after Easter: May 21
Seventh Sunday/49 days after Easter: May 31
Day after Whitsun: June 1
Day after Whit Monday: June 2
First Thursday after start of Pentecost: June 4 Friday of the week of Whitsun: June 5
First Sunday after Pentecost: June 7
Thursday after Trinity Sunday; 60 days after Easter, or the Sunday immediately following this: June 11
First Thursday after Corpus Christi: June 12
19 days after Pentecost: June 18
Sunday nearest to June 29: June 28
Second Sunday in July: July 12
Last Sunday in July: July 26
Third Weekend: August 15-16
Thursday following the first Sunday: September 6
First Sunday after September 4: September 6
Weekend after first Monday: September 7
Second Sunday: September 13
Third Sunday: September 20
Monday after third Sunday: September 20
First Sunday: October 4
Second Sunday: October 11
Last Sunday: October 25
Saturday between October 31 – November 6:
Second Sunday before Advent: November 8
Second Wednesday before the First Sunday in Advent: November 11
Sunday nearest November 11: November 14
Last Sunday before First Advent Sunday: November 22
Fourth Sunday before Christmas Day: November 29
First Friday: December 4
First Sunday: December 6
Seven days, starting on First Monday: December 7-13
Sunday two weeks before Christmas: December 13
Second-final Sunday before Christmas Day: December 13
Thursday of the last full week before Christmas: December 17
Last Friday before Christmas: December 18
Last Saturday before Christmas: December 19
Sunday before Christmas: December 20
Winter Solstice: December 21
The Sunday between Christmas Day and New Year's Day (both exclusive), or December 30 if both Christmas Day and the Solemnity of Mary, Mother of God are Sundays: December 27