For the last 20 years, I have regularly attended the Cornerstone Music Festival in Bushnell, IL. Over the fourth of July weekend, they host a number of concerts, seminars, and films featuring a variety of topics in the alternative and cool corners of Christianity. In 2012, they held their final festival. Here are links to some great concerts and trips around the campsite over the years
Links to travelogues about what it's like to experience the Cornerstone Festival
Classic Cornerstone concert clips