Question on Sunday obligation

While Pete gets to have the day off down in Florida, I’m hoping we can put him to work a little bit with a canonical question.
A notice on my local parish‘s bulletin board announces a day of recollection to be held at a shrine in a nearby diocese on a certain Saturday. The notice says that the 4 p.m. Mass that ends the day’s program will be a Saturday Mass and will not fulfill the Sunday obligation.
My question is: is that right? Plenty of parishes will offer Sunday vigil Masses at 4 p.m., and those will fulfill the obligation; does observing the Saturday liturgy make a difference? If I remember right, a wedding Mass on Sunday afternoon fulfills the obligation, and of course that is not the regular Sunday liturgy either.

Categorized as Canonical