I would like to invite you to PolyConf conference (aka RuPy).
PolyConf is a three-day, single track, multi-disciplinary conference on advanced technologies for programmers interested in polyglot approach to software development.
PolyConf 2015 will take place July 2-4 in POZnan, Poland.
The Call for Presentations is open till March 28th.
http://polyconf.com
CFP: http://bit.ly/polyconf15-cfp
Feel free to contact us on hello@polyconf.com