The Solemnity of Mary, Mother of God is 1 January 2015 and is a Holy Day of Obligation.
Mass schedule is:
Wednesday, 31 December New Year’s Eve
5p Sung Mass—Vigil of Mary, Mother of God
Thursday, 1 January New Year’s Day
10a Solemn Mass of Mary, Mother of God
12N Low Mass of the Circumcision (Latin)
5p Hispanic Mass