Spixie33 that is exactly what was going on when the 2 year old drowned here in Orleans, Ontario and that started the ministry cracking down on their rules and telling us that playdates were against the rules. Several caregivers had been regularly getting together all summer in each other's places and the child drowned in a pool that was in the yard of the house they were all playing at.
Just for information the daycare providers in question have been charged for operating an illegal daycare centre - ( more than 5 kids on the premises at a time) and will be fined at minimum. Not sure if the full outcome has happened yet but that is the last word I read in the paper.
Up until this time we all thought it was ok from sharing a music teacher to having a playdate in the winter or a waterplay day in the summer. Well we were wrong. It is against the law. A lot don't know this. We do here in Ottawa because of the tragedy. No idea if they will be more vigilent about enforcing it in other cities or not. Guess people will have to decide if having their daycare closed for good and paying a fine is worth the playdate.