RuPy2013.

Strongly Dynamic Conference Connecting Hemispheres
RuPy is a unique conference that brings together communities from different state-of-the-art programming languages Ruby, Python, JavaScript, Clojure and related technologies.
November 16-18 in Brno, Czech Republic 2012.
14-16 October, Poznan Poland, RuPy 2011.
October 11-13, Budapest, HU, RuPy 2013.

Registration and ticketing:
http://11.rupy.eu/
http://12.rupy.eu/
http://13.rupy.eu/