A complete list of Holy Days of Obligation and their observances for 2023 are:

Sunday, January 1, 2023
Solemnity of the Mary, the Holy Mother of God

Thursday, May 18, 2023
Solemnity of the Ascension of the Lord

Tuesday, August 15, 2023
Solemnity of the Assumption of the Blessed Virgin Mary

Wednesday, November 1, 2023
Solemnity of All Saints

Friday, December 8, 2023
Solemnity of the Immaculate Conception of the Blessed Virgin Mary
Patronal Feast of the United States of America

Monday, December 25, 2023
Solemnity of the Nativity of the Lord (Christmas)
Please note:  In the Archdiocese of Philadelphia, the Vigil Mass cannot be celebrated before 4:00 PM.