Holy Day of Obligation | December 8 November 20, 2018 November 20, 2018Announcements, Bulletinadmin December 8 celebrates the Immaculate Conception of the Blessed Virgin Mary and is a Holy Day of Obligation. Mass in English will be at 8:00 a.m. A Vigil Mass in Spanish will be on December 7 at 7:00 p.m.