 I'm 82 now. Can I go to a vigil mass Saturday night? I've been doing that for many years now. Oh, of course, yes. Instead of going on Sunday. No, of course, that's fine. The Saturday night mass is the Sunday mass. You see, the monastic custom is that the monastic custom was always to follow the Jewish custom. For Jews, the day begins at sundown. And in the monasteries, you will see first vespers of Sunday is said on Saturday evening.