I havent been to Defcon, sadly after so many opportunities to go even many years ago.. but if I were to go now - I would go with the express desire to be hacked.

I would go with a fresh machine, a new phone, and anythin else I could think of and just walk around like an open christmas tree waiting to see how many santas came and left presents on my devices. (Clearly I would never have logged into anything from these devices - just band new logins.

Or create accounts for them on Reddit, HN, other sites - logged into these sites once... and see what would happen.