https://www.openfest.org/2016/en/2016/10/05/call-for-volunteers/ OpenFest is the only conference of its kind in Bulgaria, dedicated to open culture, free and open-source software, the free exchange of knowledge - a festival of the open culture. Wed, 05 Oct 2016 20:36:33 +0000 hourly 1 https://wordpress.org/?v=5.2.20