Short answer; US. In '04, though, not back when this thread started.
When we got home, I posted this. Didn't get a single response.

Subject: Avalon music fest
From: frogprince - PM
Date: 25 Aug 04 - 11:17 PM

Went to the Avalon Music Festival in W.Virginia in mid month. So much good stuff, Amelia Spicer Carla Ulbrich,Joe Glazer, Mad Agnes, etc. etc., and John Gorka headlining, and not a very big crowd. Are people unaware of the fest, or unable to deal with a clothing optional setting? Do any performers feel they would damage their careers by performing there? What are your reactions, either as performers or possible audience?