For the Holy Day of Obligation, we will be offering the following Masses: a Vigil Mass for the feast on December 7th at 7PM and then on the day itself a Mass at 8:30 AM and a Traditional Latin Mass at 11:15 AM.  Although the prayers will not be of the Mass you can fulfill your obligation by going to the 5PM Mass on the 8th provided that you also go to a Mass the next day for the Sunday obligation.