Holy Days of Obligation
January 1st (Thursday) - Solemnity of Mary, the Holy Mother of God
May 14th (Thursday) - Solemnity of the Ascension of the
Lord, this Solemnity is transferred to Sunday, May 17th
August 15th (Saturday) - Solemnity of the Assumption of the Blessed
Virgin Mary [not a Holy day of Obligation because it falls on a Saturday]
November 1st (Sunday) - Solemnity of All Saints
December 8th (Tuesday) - Solemnity of the Immaculate Conception of
the Blessed Virgin Mary, Patronal Feast day of the United States of
December 25th (Friday) - Solemnity of the Nativity of the Lord
Follow this link for additional information regarding the liturgical year on the website of the United States Conference of Catholic Bishops.
Follow this link for an online liturgical calendar on the website of the United States Conference of Catholic Bishops.