Prong have announced a summer European tour. The trek will find the band celebrating the 31st anniversary of “Cleansing.” Here’s the dates: 07/30 Hamburg, GER – Bahnhof Pauli 07/31 Wacken, GER – Wacken Open Air 08/01 Berlin, GER – Hole 44 08/02 Aschaffenburg, GER – Colos-Saal 08/03 Stuttgart, GER – Im Wizemann 08/05 Aarburg, SWI…