Not my idea of a fun time (the activities planned, that is), but hey, if you think it's going to be great, then I can't stop you.
I personally wouldn't meet with anyone who I haven't known for a while first. Just turning up to one of these random meets could be a bit dangerous. And from previous meets like this in the past, you'll get a turnout of the older crowd. Kids these days seem to be getting educated about the internet and not to meet up with strange people.
*shrugs* Just to point it out...