Eleven Days, 11 Stages, over 800 Acts, and over 1,000 Performances "“ that's the Summerfest Music Festival in Milwaukee, Wisconsin. It's the largest music festival in the world and we're trying to make it there. Our School of Rock Katy House Band would like to show the world how Katy, TX rocks by performing at the School of Rock Battle of the Bands contest at Summerfest this year. Our House Band played this event last year and very nearly took home the championship. We think we have a great opportunity to win it all this year, but we need your help. You can show your support for young rockers by contributing to our Summerfest Fund. Your contribution will go directly to offset the cost of our contest entrance fee and other performance costs.