I'm playing as part of the underground collaborative improvised experimental music festival called XFest I've played it for many years, various locations.
(NO relation to other, less pleasant things with x in the name...)
It's August 15-17 in Haverhill this year, at a private residence. Details at https://xfestma.com/
XFest groups performers in unfamiliar configurations, challenging them to collaborate and explore their sonic and physical dynamics during 20 minute improvisations. Performers range from DIY to formally trained musicians, dancers, video, and visual artists from New England and beyond. As a weekend-long workshop, XFest provides the space and time for improvisers to interact through performance in front of an attuned audience of their peers.
XFest is a labor of community, funded by the organizers and participants.