Celebrate the summer season, and participate in a good cause with the Tunes for Trails / Perks for Parks free concert series. Throughout the summer, join the fun at the Amphitheater at Philip S. Miller Park. Gates open at 5:30 p.m. The concert will begin at 6:30 p.m. Enjoy some time with the family before the show with yard games and bounce houses. Food and alcohol are available for purchase. While this is a free event, donations will be accepted for the Castle Rock Parks and Trails Foundation.