That was going to be my first question, if they use some adhoc stuff or not? Considering it is an iPhone app (maybe not) and ofcourse there are technical challenges of who hosts the message.
Of course there's also the battery and signal issues that would make it useless at any festival I've ever been to.
Maybe there are other situations in which it would be useful though...
Why don't people just turn off their phones and enjoy the concert/event/whatever?
Meh what is society coming to!
Presumably, you restrict people from joining a party based on their location. But I imagine there are a few edge cases. For example, if I'm on my way to a concert but want to know something about a tent beforehand, can I do it?
Perfect ground for a Web 1.0 multi-million dollar marketing barrage, but kinda difficult otherwise.
I will definitely try to spread the word in Boston. Good luck!