Canon 1246, §2 - Holy Days of Obligation: "On Sundays and other holy days of obligation the faithful are bound to participate in the Mass." (CIC, can. 1247)
"The precept of participating in the Mass is satisfied by assistance at a Mass which is celebrated anywhere in a Catholic rite either on the holy day or on the evening of the preceding day.
January 1 | Solemnity of Mary, Mother of God |
Thursday of the Sixth Week of Easter | Solemnity of the Ascension |
August 15 | Solemnity of the Assumption of the Blessed Virgin Mary |
November 1 | Solemnity of All Saints |
December 8 | Solemnity of the Immaculate Conception |
December 25 | Solemnity of the Nativity of Our Lord Jesus Christ |