From Hack Story

Northern Europe has a system of hacker camps which happen more or less every 2 years since the early years of the 21st century. Roughly, every 4 years it happens in the Netherlands and every other 4 years it happens in Germany. The camps in the Netherlands have different names and the camps in Germany are always called Chaos Communication Camp. The camps in the Netherlands are organised by different legal entities and the camps in Germany are organised by the Chaos Computer Club. The camps draw several thousand participants over a few days. The conference programme is complemented and overshadowed by a whole range of self-organised spaces, events and opportunities.

Hacker camps in the Netherlands

1. 1989, Galactic Hacker Party (HGP1989), in the Paradiso, Amsterdam (indoor, 72hrs)
2. 1993, Hacking at the End of the Universe (HEU1993), Zeebiesweg, next to Lelystad, near Amsterdam
3. 1997, Hacking In Progress (HIP1997), Kotterbos, next to Aakweg, near Almere
4. 2001, Hackers At Large (HIR2001), University of Twente, near Enschede
5. 2005, What The Hack (WTH2005), Liempde
6. 2009, Hacking At Random (HAR2009), Paasheuvel, near Vierhouten
7. 2013, Observer. Hack. Make. (OHM2013), Geestmerambacht

Chaos Communication Camps

1. 1999, Paulshof, next to Altlandsberg, near Berlin
2. 2003, Paulshof, next to Altlandsberg, near Berlin
3. 2007, Finowfurt airport and aeronautical museum, near Berlin
4. 2011, Finowfurt airport and aeronautical museum, near Berlin

Sources

1. Wikipedia
2. Emmanuel Goldstein (ed.): The Best of 2600, Collector's Edition -- A Hacker Odyssey
3. HIP1997 call
4. webmind and Patrice Riemens, personal communication