I made a seach on the forum but it seems nobody mentionned it.
It's a music festival in Saint-Julien-en-Genevois, with some good stuff
-Gotthard (with their new singer)
-John Paul Jones
-G3 (Joe Satriani-Steve Vai-Steve Morse)
and some others I don't know....
Have a look there http://www.guitare-en-scene.com/ for the program, the prices and the place.