December the 8th is the feast of the Solemnity of the Immaculate Conception of the Blessed Virgin Mary and is a Holy Day of Obligation for all Catholics. Catholics are required to attend Mass on a Holy Day just the same as if it were a Sunday. This Mass DOES NOT fulfill one's obligation to attend Mass to celebrate the Second Sunday of Advent which is our 5:30 p.m. Vigil Mass this evening.