The 30th Chaos Communication Congress (30C3) is an annual four-day conference on technology, society and utopia. The Congress offers lectures and workshops and various events on a multitude of topics including (but not limited to) information technology and generally a critical-creative attitude towards technology and the discussion about the effects of technological advances on society.
Livestream on you tube:

Official website: http://events.ccc.de/  / http://www.ccc.de/
Twitter: #30c3 @ccc
Berliner Zeitung
Kongress des Chaos Computer Clubs Das Woodstock der Anti-NSA-Hacker