The same day we're also in Poznan, on a must-see Poznan Open Source Event located at Poznan University of Technology.
Btw. conference name is pretty funny because it's originally abbreviated as PIWO, in english BEER. Now you understand, why I say "must-see" :)
Hopefully they don't give us as long straws as it was recently on Juwenalia:

hope, then everybody'll be ready for DemoCamps invasion!