Seconded http://superhappydevhouse.org/ http://superhappydevhouse.org/ I'd also recommend http://www.meetup.com/thestartupwaffles/ http://www.meetup.com/thesta

Seconded http://superhappydevhouse.org/ http://superhappydevhouse.org/ I'd also recommend http://www.meetup.com/thestartupwaffles/ http://www.meetup.com/thestartupwaffles/ (if you're an entrepreneur), or any of the weekend hacker events like http://startupweekend.org/ http://startupweekend.org/, http://www.meetup.com/sv-gtug/pages/GTUG_Campout:_Silicon_Valley/ http://www.meetup.com/sv-gtug/pages/GTUG_Campout:_Silicon_Va... are good as well.