Police investigators have been told a group of people were fighting outside the Eildon Holiday Resort on Goulburn Valley Highway in Eildon just before midnight.
It is believed one of the men was struck before falling and hitting his head on the ground.
Country rock band Ruckus was performing at the venue last night which was offering free lifts to patrons.
Police detectives have this morning swarmed the pub as they gather evidence surrounding the man’s death.
Items of clothing including a jumper and hat can be seen laying outside the venue where a police tent has been set up.
Anyone with information or who may have witnessed the incident is urged to call Crime Stoppers on 1800 333 000.