https://www.openfest.org/2018/en/2018/09/21/call-for-speakers-openfest-2018/ 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. Fri, 21 Sep 2018 21:13:30 +0000 hourly 1 https://wordpress.org/?v=5.2.20