The largest extreme sports, music and adrenaline festival in Eastern Europe, Pannonian Challenge is bringing together the biggest pro BMX, skate, inline names and top musicians, takes place in mid-summer in Osijek, Croatia Pannonian Challenge has been bringing top BMX, inline and skateboard riders to Osijek every year since 1999. Each summer on the left Drava bank, you will be able to marvel at and enjoy pro stunts and later go to punk, rock, and hip-hop concerts as well as DJ sets that will not disappoint.