Join a small group of other Ruby coders for a few hours of project hacking. Those without a project are invited to join pairs, and those with a project are invited to hack code. Anything Ruby is fair game: Rails pull requests, that crazy late-night idea, implementing your own programming language in Ruby, working through a Ruby tutorial, placing bets on the colors of DHH's sneakers, working on your startup, starting your startup, and so on.
There will be food and drinks.
Bring a laptop, bring an idea, and bring your passion!