I think it's a good idea. I've been thinking about it as well! There are people who take their kids out to socialize and have groups of parents get together so their kids can play, so why not cats? Cupid is an only child, but I think he'd like cat-play, especially if he gets to come back to his home and doesn't have to share me.
I've been thinking about looking for people close to me (but I live in a small town) who want to get together once a week or so for kitty play time. The woman who owns the company I buy my cat food from has offered to let us come down there and visit. She has a really nice play area for her cats, but she lives 2 hours away.
You don't happen to live in Texas, do you?