ABOUT THE FESTIVAL The Midsummer Prog Festival is an exclusive music festival experience not to be missed. Midsummer gives you the opportunity to see some of the world’s finest progressive rock bands take to the stage at the beautiful open air amphitheatre in Valkenburg (near Maastricht), The Netherlands. The first edition of the festival on June 24th 2017 was sold out months before the date. The line-up was Anathema, Gazpacho, Pain of Salvation, iamthemorning, Caligula's Horse. For the second edition we would like to welcome Riverside and Amplifier! More bands to follow.