DETECTIVES are seeking information regarding a serious assault during the Listen Out Festival at Arena Joondalup on September 25.
Between 4.30pm and 4.45pm, a man was waiting for a friend outside the toilets near the main stage.
When the friend returned, she found him lying on the ground with head and face injuries.
The 19-year-old man from Golden Bay was taken to Fiona Stanley Hospital where he had surgery for a broken jaw.
Call Crime Stoppers on 1800 333 000.