"On Sundays and other holy days of obligation, 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."
Catechism of the Catholic Church 2185

Tuesday, January 1              Solemnity of Mary, Mother of God

Thursday, May 30                 Solemnity of the Ascension of Jesus

Thursday, August 15            Solemnity of the Assumption of the Blessed Virgin Mary

Friday, November 1              Solemnity of All Saints

Monday, December 8           Solemnity of the Immaculate Conception
Usually a Holy Day of Obligation but is not in 2019. The USCCB explains, “Since December 8, 2019, is the Second Sunday of Advent, the Solemnity of the Immaculate Conception of the Blessed Virgin Mary is transferred to Monday, December 9, 2019. The obligation to attend Mass, however, does not transfer.”

Wednesday, December 25         Solemnity of the Nativity of our Lord Jesus Christ