Ricochet Gathering

„Ricochet Gathering is a unique collaboration event for electronic music. This name applies to the event and also the group of musicians involved in the event, where a group of musicians and a usually small group fans gather at unique locations throughout the world. The event happens approximately once each calendar year. [...] All music created at each event is live, unrehearsed, and improvised - and captured in one take.“
https://en.wikipedia.org/wiki/Ricochet_Gathering