Agreed that Defcon is the place to be. I guess RE: people watching many of the Blackhat attendees stick around for Defcon. It is fun to pick them out of the crowd, or to just chat them up. Speaking of, there is frequently agents from various TLA’s there who want to stay current - - which is where the age old Defcon game of “spot the Fed” comes from. It is pretty good natured and said feds will cop and show their badge if a speaker calls them out in the audience.
And my God, the Defcon badges are sooooo cool. Mine from a few years ago you can solder ports on and it is a fully functional mini computer.