well the CCC crowd has many years of experience on their belt dealing with the absurd amount of traffic that only a nerd conference can sustain - and they do all of it on their own, the only thing the venue has to give them are rooms, power and fiber uplinks. CCC erects a whole damn ass datacenter and tears it down in a few days, that's a massive expense both financially and in volunteer time. Oh and on top of that comes all the video streaming and recording infrastructure, that stuff is rivaling actual large TV networks from what I hear.
In contrast, for almost all other venues, providing networking is the responsibility of their owner, and they plan their networking gear not for the "one conference to rule them all" but for your everyday trade show.
The video team has a wiki [1] and the NOC a few photos on mastodon [2]. There used to be at least one more detailed report but FFS Google is useless these days.
