January 1st is a Holy Day of Obligation. Mass will be held at 10:00 a.m. The Solemnity of Mary, the Holy Mother of God is a feast day of the Blessed Virgin Mary under the aspect of her motherhood of Jesus Christ, whom Christians see as the Lord, Son of God. It is celebrated by the Latin Rite of the Catholic Church on 1 January, the Octave (8th) day of Christmastide.