Located in Riverside Park next to the Convention center in Oshkosh - I visited the website for this venue and was greeted with a slide show of some pretty impressive names.
"The venue hosts a diverse range of artists, festivals and events from May through September, including Waterfest . With a capacity of nearly 7,000, guests can enjoy a seat on the spacious lawn, walk the grounds and check out the gazebo or enjoy the action right in front of the stage on the brick plaza." - so says
www.leachamphitheater.com
It looks like I may have to visit some friends in Oshkosh next summer and check this place out! It looks really pretty!