I'm taking my two sons (ages 6 & 3) up to Bemidji State Park to watch a free performance by Paul Imholte. Very talented folk musician. He plays fiddle, mandolin, banjo, and the hammered dulcimer. The hammered dulcimer is the highlight for both myself and my kids.
If you're not familiar with it, here's a short video.
http://youtu.be/kQlLyqF6VrI