I need some help with this one, erudite Catholic readers.
I was just looking ahead, and noticed that the the Assumption of Our Lady falls on a Saturday this year. Of course this means that the obligation is abrogated, but that's not my question.
What about Saturday night, at the ordinary vigil Masses? I am told that they will be the Mass of the Sunday in Ordinary Time, not the Mass of the Assumption. I suppose this is correct, but I don't know why. Solemnities of Our Lady far outrank Sundays in Ordinary Time, but we're not really talking about the same day here, just a particular kind of intersection of liturgical days.
Is Evening Prayer of that day Evening Prayer I of the Sunday or Evening Prayer II of the Assumption? (My ordo says "EP II of sol.") But I am assured by those with more experience that the Saturday evening Masses are of the Sunday. Is it because the Sunday obligation would not be fulfilled otherwise?
Thanks for the help. Citations from authority would be a big help.