https://www.openfest.org/2015/en/2015/08/20/call-for-speakers-2/ 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. Thu, 20 Aug 2015 20:32:46 +0000 hourly 1 https://wordpress.org/?v=5.2.20