People dance in a mud pit near the main stage at the Woodstock Festival in Kostrzyn-upon-Odra, close to the Polish-German border, early August 2, 2014. Some 500,000 people attended the festival that is the brainchild of Polish journalist and social campaigner Jerzy Owsiak. He initiated the event to say thank you to those who donated money to his GOCC charity organisation that delivers medical care for children. REUTERS/Thomas Peter (POLAND - Tags: ENTERTAINMENT)