I really, really like this. I organize a fair number of small events with friends, and have been thinking for a while that I'd throw something like this together to make it easier to manage RSVPs while still enabling the actual invite to go out over real email. I agree with what's been said that it's a _little_ too simple, but not much. Event name would be nice for a descriptive url, etc, maybe host name. Keep cracking, I'm a user.
Web crawlers can't go there and you can undo the delete... so POST-only is more of a "best practices" thing than a necessity. But I'll do that and yes, not obfuscating post count is bad.
