Better attendance, maybe
No late night at school
Probably fewer kids left at the end of the concert waiting for a ride
You're working on a Sunday
You're asking your kids to "work" on a Sunday
Unless you rehearse on Saturday, your concert is 48+ hours after your last rehearsal. I know MY kids wouldn't have their best performance in that situation.
You'll likely have several families who won't attend due to church obligations, and you can't fight the religion card.
Personally I wouldn't do it, but it depends on your clientele.