Inasmuch as the Solemnity of Mary, Mother of God falls on a Monday in 2018 and is, therefore, not a holy day of obligation, the Feast of the Holy Family should be celebrated at evening Masses on December 30, 2017. For more information, see the commentary in the September 2017 issue of Liturgy Update.
December 30 and January 1: Feast of the Holy Family and Solemnity of Mary, Mother of God
by Fr. Matthew Ernest | Dec 1, 2017