If you are looking for some outdoor entertainment in northern Wisconsin, go to the Big Top Chautauqua! Musicans and actors perform for audiences under a huge big-top circus tent. Check out my article about The Big Top Chautauqua.
Sorry for the late response. In regards to the Big Top Chautauqua, the concerts run all summer long from June through the end of the summer. They have many artists performing throughout the season. It's a great place to listen to music in the outdoors. Have fun if you go!