My wife and I went to check out an art studio (NJ, USA) for children to see if we can send our 4-year old son there to learn some drawings.
It came to my attention that there were a bunch of 5,6-year-old boys and girls sitting in the studio drawing pictures but their parents (at least not all) weren't there in the waiting room.
While there was a teacher in the room looking after the children, I am not sure: Is it legal to leave children of that age alone without parents' being nearby? What if a child needs a bathroom break?
After all this is not a daycare and I don't think teachers there have license that entitles them to look after children in the parents' absence.