ECSC (European Cybersecurity Challenge) is an European event bringing together young cybersecurity from across Europe. Each participating country brings its team to the competition, and all the teams compete around a CTF over 2 days.
Contestants are challenged in solving security related tasks from domains such as web security, mobile security, crypto puzzles, reverse engineering and forensics and in the process collect points for solving them.
https://www.ssi.gouv.fr/agence/cybersecurite/challenge-europeen-de-cybersecurite-ecsc-2019/