Their self-description
(source)
The LinuxDays conference 2020 means two days of talks, workshops, booths of various projects (Fedora, Gentoo, Slax, openSUSE, vpsFree.cz, Python, Mozilla, brmlab, OpenAlt etc.), electronics ham-shack for children, lots of interesting people and lot of new information. Although the event is primarily held in the Czech language, there will be talks in English as well. The event is free of charge.