Question: In which city does this annual convention (first occurred in June 1993) that Iftach Ian Amit founded take place ?
Sentence (from "DEF CON"): DEF CON (also written as DEFCON, Defcon, or DC) is one of the world's largest hacker conventions, held annually in Las Vegas, Nevada, with the first DEF CON taking place in June 1993.
Relevant evidence: Yes