These would fit with Rudolstadt.
Colour Cafe Festival, Brussels, June 24-26. A bit of everything!
http://www.coureurcafe.be
Park Blues Festival, Lommel, Belgium, 25 June. One day only. http://www.parkblues.be
Wereldfolklorefestival, Izegem, Belgium, a big folk dance festival, held every two years. June 30-July 5, 2011.