From: https://lehack.org/

LeHack (formerly Nuit du Hack) is one of the oldest and largest hacking conferences in France, founded in 2003. Originally known as Nuit du Hack (NDH), the event rebranded to LeHack in 2019. The conference brings together security researchers, hackers, and enthusiasts for talks, workshops, CTF competitions, and bug bounty events. It is organized by HZV (Hackerz Voice) in collaboration with Sysdream.