We have monthly hackathons in the Philly area for people working on or interested in startups (primarily Internet related). A hackathon is an event with no specific agenda--everyone comes and "hacks" on their projects. It is a great place to meet other local hackers and get feedback/help on your projects.
Every month we have the meetup at a local Philly company where cool hacking is going on. We have pizza for dinner, hang out and talk about our startup experiences, and hack on our projects together.