The Derletalfest promises plenty of rock music and information about Hardtberg's local associations. From 2 p.m., local associations such as the Bonn Rhein-Sieg Cat Protection Association and the German Maritime Search and Rescue Service (DGzRS) will be presenting themselves. The Derletalfest has been taking place since 1985, and in 2018 the "Rock im Tal" music festival became an integral part of the program. The specific program is still being drawn up by the organizers.