RT Article T1 Canon 1247: Whether a vigil Mass Can fulfill two obligations JF Roman Replies and CLSA Advisory Opinions 2020 SP 143 OP 145 A1 Spiering, Samuel LA English YR 2020 UL https://ixtheo.de/Record/1795099933 AB Sometimes a holy day of obligation (such as Christmas or the Immaculate Conception) falls on a Saturday or Monday. The Church allows us to fulfill our obligation to attend Mass for those days at a Mass the evening before the holy day or Sunday. Thus, the question frequently arises among the faithful: can attendance at one Mass on the evening of the Sunday, which is the evening before the holy day (or vice versa), fulfill the obligation for Sunday and the Holy Day? SN 9781932208566