Nikki and Ed Miro created and run Octopus Game.
It is built to introduce people to Def Con in a fun, approachable way.

A diversity-driven conference committed to helping all underrepresented people in Information Security. The Diana Initiative features multiple speaker tracks, capture-the-flag competitions, villages with hands-on activities, and workshops. 

The LHC is a loose collective of people interested in hacking. LHC began on /r/defcon as a way for people attending DEF CON ‘alone’ to meet up with other people.