Hack4 has announced its Call For Papers. It will be held December 28th through the 29th, 2015 in Berlin, Germany.
You can download it from the following link: https://packetstormsecurity.com/files/download/133980/hack42015-cfp.txt
Source: https://packetstormsecurity.com/files/133980/hack4-2015-Call-For-Papers.html