If you expect to be in or around Minneapolis on the 23rd of May you might want to try out this event:
Mobile Music for Everyday People: A Symposium on Mobile Music and Sound
Friday, May 22, 8am-6pm
Saturday, May 23, 8am-3pm
Minneapolis, Minnesota, U.S.A.
Michael Bull, author of Sound Moves: iPod Culture and Urban Experience
Featuring Ali Momeni and Jenny Schmid with Minneapolis Art on Wheels