Considering how anti-social most hacker-types are, maybe its better if you make it a session with a "purpose" instead, such as perhaps a gathering where each person gets to show everyone something you are working on.. (etc). Otherwise, gathering just for the sake of gathering doesn't sound appealing enough.
But if the event does go down, I'd be willing to show up.
I would suggest that you search on MeetUp.com and look for topics that interest you like Ruby, PhP, Opensocial, Iphone, etc ....
In fact there is a New Tech Meetup every first Tuesday of the month near DLA Piper, Palo Alto. They have about 3-4 demos by hackers/founders followed by networking. I have easily seen 150+- people.
NP, I'm actually glad someone is making an effort to do this.
Recently I've been making an effort to talk to more people (offline and real conversation) instead of being holed up in the CS lab coding all the time and its amazing how positive of an effect its having on my mood and creativity =)
But if the event does go down, I'd be willing to show up.