AJV;5552569:
I could see an argument for the Mass of the Assumption insofar as the II Vespers of the Assumption outranks the I Vespers of Sunday. The CDW declared in 1974 that the best practice was to align the Mass with whichever day of which Vespers was celebrated - though it also gave the diocesan bishop leave to depart from the rule.
Once we get into a Mass that’s celebrated on Saturday evening according to the secular calendar, things do get complicated. If it’s liturgical Saturday, the Mass is still the Assumption.
I think it makes a lot of sense for bishops to say “any Mass on Saturday evening cannot be the Mass of the Assumption” in order to avoid confusion.
I think there was a misunderstanding here that Saturday itself is no longer the Assumption, and that was what I was trying to clarify. In other words, I think some readers might have gone away from this thread thinking that Saturday 10 AM Mass would somehow not be the Assumption.
Pastorally speaking, the best response to this problem of an “overlap” in the calendar is to schedule the Mass(es) of the Assumption at a time early enough that it would not cause confusion–in other words, not on Saturday evening, nor even close enough to evening to cause confusion. Keep it in the morning or early afternoon, just to be on the safe side.