We are celebrating the first year anniversary of the co-founders meetup, in Mountain View (a few blocks from YC headquarters). We have a pretty strong line-up of founders. Normal entrance fee is $10, but all people with technical skills, not currently working on their own startup, are invited to attend for free.
That's Nov 2nd. URL is http://www.meetup.com/Co-Founders-Wanted-Meetup/calendar/14858537/