HackYeah 2026

Europe's largest stationary hackathon, returning for its 12th edition at Tauron Arena Kraków on 3-4 October 2026 — a 24-hour build sprint organised by PROIDEA. Teams of 1-6 tackle open challenge categories (Defence, Sport & Healthcare, Smart City, and AI) plus a justCTF capture-the-flag track, with corporate and government challenge partners. A high-signal place to prototype, recruit co-founders, and get in front of challenge-sponsoring organisations.