DEF CON is the world's largest annual hacker convention, held every year in Las Vegas, Nevada. The first DEF CON took place in June 1993. Many of the attendees at DEF CONs include computer security professionals, "crackers", and hackers with a general interest in computer code and computer architecture. The event consists of several tracks of speakers about computer and hacking related subjects, as well as social events and contests in everything from creating the longest Wi-Fi connection and cracking computer systems to most effectively cooling a beer in the Nevada heat.
DEF CON Media Archive
You may also find other Hackers Convensions here
Tags: Security, Hacking, Gr33n Data