Their self-description
(source)
DevConf.CZ 2020 is the 12th annual, free, Red Hat sponsored community conference for developers, admins, DevOps engineers, testers, documentation writers and other contributors to open source technologies. The conference includes topics on Linux, Middleware, Virtualization, Storage, Cloud and mobile. At DevConf.CZ, FLOSS communities sync, share, and hack on upstream projects together in the beautiful city of Brno, Czech Republic.