- Amateur CTF
- Artwork Contest(s)
- B&W Ball / "Top of the Riv"
- "Beverage" Cooling Contest
- BuzzWord Survivor
- Coffee Wars
- CTF
- Defcon Groups Meet
- Defcon Radio
- DefconBots Robot Contest
- EFF Dunk Tank
- Forum Meet
- Hacker Jeopardy
- Lockpicking Contest (aka: LPCON)
- Lost @ Con Mystery Box "Sub Challenge"
- Net Appliance Challenge
- PGP Key Signing Party
- Photo Submission Contest
- PokerCon
- QueerCon
- Scavenger Hunt
- Spot the Fed
- The Summit
- Sushicon / Shmooshicon
- TCP/IP Enabled Device and Peripheral Contest
- Toxic BBQ
- (WarDriving) Wireless Contest