36c3 (CCC) is apparently an annual meetup of the weird and wonderful.
Lots of hackers, in the broadest definitions of the word.
Arrived 1905-ish, queued for maybe 10 minutes and got a wristband! Got a bit confused how to use the wristband ( so there's a metal thing that gets crimped so you can't take it off ) but the angels were super helpful
Leipzig Messe is not small, people brought scooters / hoverboards / rollerskates? Should definitely consider.
Not everything is setup yet but starting to see RGB glowing things