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One final note: everyone has their own criteria for signing keys. Some people are fairly lax, and will sign anyone's key that they've met, or even just exchanged regular emails with. Other folks will only sign keys when they can prove your identity, or will use your key to send you a couple of messages over a period of time to verify that you use it. So don't be offended if someone doesn't sign your key immediately after the event.
Organizing a PGP Keysigning Event
All the code and the corresponding docs are on github.