https://www.openfest.org/2021/en/2021/06/27/call-for-participation/ 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. Sun, 27 Jun 2021 13:33:29 +0000 hourly 1 https://wordpress.org/?v=5.2.20