Explore the behind-the-scenes infrastructure of the 36th Chaos Communication Congress (36C3) in this comprehensive 58-minute conference talk. Gain insight into the challenges faced by volunteer teams in building GSM, DECT, and IP networks, managing video streams, and organizing ticket sales. Learn about the Congress organization, core infrastructure, access and WiFi setup, and incident handling. Discover sustainability initiatives, including recycling efforts and the implementation of VAAPI hardware transcoding. Delve into the intricacies of running a mobile network, from frequency allocation to base station deployment. Examine the VOC2MIX strategy update, new features, and statistics from various congress areas. Understand the complexities of managing such a large-scale event and the innovative solutions implemented to overcome unexpected simplicity and technical challenges.