In the Catholic Church, Holy Days of Obligation (also called holydays, holidays, or days of obligation) are days on which "the faithful are to refrain from engaging in work or activities that hinder the worship owed to God, the joy proper to the Lord's Day, the performance of the works of mercy, and the appropriate relaxation of mind and body.

Family needs or important social service can legitimately excuse from the obligation of Sunday rest.

The faithful should see to it that legitimate excuses do not lead to habits prejudicial to religion, family life, and health" [CCC 2185].

January 1: The Feast of Mary, the Holy Mother of God
Masses:
· Monday, Dec. 31 at 5:00pm (vigil) 
· Tuesday, Jan. 1 at 10:00am 
 
May 30 : Ascension of the Lord (40 days after Easter Sunday)
Celebrated on Sunday, June 2 this year in the Sacramento Diocese.
Masses:
· Saturday, June 1 at 5:00pm (vigil)
· any Mass on Sunday, June 2 fulfills the obligation.

August 15: Assumption of the Blessed Virgin Mary
Masses:
· Vigil on Wednesday, Aug. 14 at 6:30pm
· Thursday, Aug. 15 at 8:30am
· Thursday, Aug. 15 at 6:30pm
 
November 1: All Saints' Day
Masses:
· 8:30am
· 6:30pm

December 8: The Solemnity of the Immaculate Conception
St. Clare will observe the Solemnity on Monday, Dec. 9 with  special Masses at: 
· 8:30am
· 6:30pm

December 25: Christmas, the Nativity of Our Lord
Vigil Masses on Tuesday, Dec. 24 at:
· 4:00pm
· 6:00pm
· 8:00pm
· 12:00 Midnight
Masses on Wednesday, Dec. 25:
· 7:30am
· 9:30am
· 11:30am