PumpCon is one of the oldest continuously held hacker conferences in the US.
The conference is more than just computer security – they have had speakers discuss lock-smithing, neuro-anatomy, law, and group dynamics. Of course, there is a lot of discussion of doing neat things to computers. Whether you can actually attend or not depends … PumpCon has been invite-only for years and the only way to take part is to either get invited, be a guest of an invitee, or give a talk.
The conference is held at the end of October annually.