A developer’s workshop called the Glass Foundry is held in San Francisco. Attendees must sign a non-disclosure agreement. An email sent out to developers with Glass preorders partially reveals the purpose of the meeting:
Join us for an early look at Glass and two full days of hacking on the upcoming Google Mirror API in San Francisco or New York. These hackathons are just for developers in the Explorer program and we’re calling them the Glass Foundry. It’s the first opportunity for a group of developers to get together and develop for Glass.