Hi Hive account@cicisaja,
in the 90's many concerts were organized in this place. But current concerts need a lot more equipment, and it's problem to bring this equipment to amphitheatre (there is no road for trucks).

Since 2011 there is organized Rock festival "Igrzyska Rockowe" (Igrzyska = Olimpic Games).
In 2018, the amphitheater was renovated, so maybe in next year will be more event in this place.