https://www.openfest.org/2017/en/2017/08/21/call-for-speakers-2017-2/ 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. Mon, 21 Aug 2017 06:40:44 +0000 hourly 1 https://wordpress.org/?v=5.2.20