OP, if you don't speak to a lawyer, at least have a conversation with your insurance agent. You're assuming a huge liability if you "put your name out there" or take some of the advice of some of the other folks here about Google calendars and other steps that would formalize your arrangement. Your ordinary homeowners/renters policy will not cover something like this. You'll probably want an umbrella policy. I'm not in insurance so I don't know what product is appropriate, but when I started teaching team sports, I did get an umbrella policy, just in case a kid got hurt at practice or something.