Hinterland Music Festival  Hinterland Music Festival is a multi-day music festival held at the Avenue of the Saints Amphitheater in St. Charles, Iowa, which was first held in 2015. The festival is organized by Sam Summers, co-owner of a local music venue and booker for a concert series. Water Works Park, located along the Raccoon River four miles southwest of Downtown Des Moines, was set to host for the first year. Its inaugural edition, however, was moved to St. Charles, twenty miles to the south, due to flooding concerns at the park. It drew a crowd of 14,000 over the two days. For 2016, the festival announced plans to return to St. Charles. The festival expanded to three days in 2019. The sixth annual festival will be held on Friday, July 31 - August 2, 2020. Hinterland is known for a blend of music, camping, art, craft vendors, family engagement and more.