Call for participation for the 33C3 Chaos Communication Congress. The Chaos Communication Congress is the annual symposium and hacker party of the Chaos Computer Club (CCC). During four days between Christmas and New Years Eve, thousands of hackers, technology freaks, artists, and utopians get together in Hamburg to communicate, learn from each other, and party together. They focus on topics such as information technology, digital security, making and breaking. They engage in creative, sceptical discourse on the interaction between technology and society.