January 1, The Solemnity of Mary, Mother of GodThursday of the Sixth Week of Easter, the Solemnity of the AscensionAugust 15, The Solemnity of the Assumption of the Blessed Virgin MaryNovember 1, The Solemnity of All Saints (All Saint's Day)December 8, The Solemnity of the Immaculate ConceptionDecember 25, The Solemnity of the Nativity of Our Lord Jesus Christ (Christmas) Whenever January 1, the solemnity of Mary, Mother of God, or August 15, the solemnity of the Assumption, or November 1, the solemnity of All Saints, falls on a Saturday or on a Monday, the precept to attend Mass is abrogated.