Immaculate Conception: NOT obligatory this year: Since December 8 falls on a Sunday in Advent this year, the Solemnity of the Immaculate Conception will be observed on Monday, December 9. Archbishop Perez has dispensed the faithful from the obligation to attend Mass on December 9. The usual morning Mass will be celebrated at Saint Elizabeth on Monday, December 9 at 7:30 AM. In addition, all are encouraged to observe this solemnity by praying the rosary or engaging in another devotion in honor of Our Lady.