Events June Barcelona. The Sonar Festival Barcelona is an Advanced Music and MultiMedia festival which takes place every year in Barcelona in June. SOnar is perhaps Europe's premiere electronic music and audiovisual art festival and attracts thousands of DJs, record labels, artists and music fans to Barcelona every year. Focusing on cutting-edge electronic culture covering both music, art and film, Sonar provides a great mixture of breakthrough digital art forms and uptempo and intense club nights. Visit the festival website for more information and updates on artists line up.