there are at least a dozen parishes here, including campus ministry center, that have Sunday evening Masses, and come to think of it they seem to me more conservative parishes, so it must be okay, our bishop is pretty strict about this stuff. but every parish also has Saturday evening Mass as well. that is our second most crowded Mass, so it must be popular.
I love to go to 5:00 Sat especially if I work late because of catechist training, quincenera, wedding etc., also if I have a lot going on on Sunday-1st communions, RCIA etc., because then I feel I am going to Mass for worship, not as part of my job.