Global day of coderetreat 2015

For those of you who don't know what a coderetreat is:
It is a full day of deliberate code practice with the craziest constraints and loads of fun. This event is a global event where over 3000 developers gather worldwide to practice and share their experiences with other countries.

If you want to know more about the coderetreat, please read here: http://www.co-learning.be/#agenda/coderetreat