Extremely impressive event (YouTube video). Happens once every 4 years or so in Germany, it’s basically a big get together of hackerspaces, for inspiring each other, showing off, partying, learning, playing. Chaos Communication Camp website
I normally describe hackerspaces as like decentralised libraries and places of study/experimentation, organised along Do-It-Together principles. The Wikipedia page includes a history
If you’re able to visit a nearby hackerspace before the event then I’d recommend it. If anyone happens to be based in Newcastle then I felt the Star & Shadow repair space is a good basis for becoming a hackerspace (lots of hackerspaces offer repair meet-ups where people can get help fixing their own stuff), but I’m not based there anymore so can’t help much to set it up