I sent two DDs off to other people's homes with their inhalers, which they knew how to use by themselves, and also when to use. They tended to be inhaler resisters, so I asked the other parents to make them use the inhalers before going outdoors for a stretch and also if the other parent noticed a frequent throat-clearing sort of cough.
One DD sleep-walked, and I always told the other parent this. Similar information was shared with me by parents of children I was hosting. I have administered ABs and other medicines evening and morning, supervised brace cleaning, adjusted the menu to account for new braces and food allergies, and supervised inhaler use.
I always contacted the other parent to report unscheduled inhaler use, and also to report any problems reported such as headache or stomach ache (sometimes indications of anxiety on the part of the child), and any long nosebleed or serious bump to the head.
I never took anyone to the cinema or even to get an ice cream. It would have set an expensive precedent. We watched dvds aplenty, at home. DS and his friends liked to hog the wii.
Most of the people I knew were happy to have one less child of theirs to deal with - they were busy families who usually spent a good deal of time schlepping their children and the children of others here and there in the evenings and on weekends. I think they would have found the concept of a reassurance call as a matter of course a bit strange. Notification of some unusual circumstance - perfectly reasonable. People are and were more casual in my community about car pooling, playing, sleeping over. I think we all operated on the 'no news is good news' philosophy.