People who went to the Bugjam event at Santa Pod Raceway are being asked if they know how a man suffered a broken jaw.
Bedfordshire Police is appealing to people who were near the Live Stage at the event at Santa Pod, in Podington, on Friday night/Saturday morning (July 20/21).
Event staff called police at about 2.30am when they went to the assistance of a man who had received head injuries while coming from the Dance Zone towards the Live Stage.
Staff intervened when they saw a crowd gathering around the man who was already injured. They went over to help and called an ambulance.
The 20-year-old man had become separated from his friends and eventually lost consciousness.
After initial emergency treatment at Bedford Hospital he was transferred later to Luton and Dunstable hospital for an operation by maxillo-facial specialists for a jaw broken in two places.
He cannot recall what happened but officers believe from his injuries that he is likely to have been assaulted.
PC Ben Sykes is appealing to anyone who was near the Live Stage in the early hours of the morning, or who has any information at all that could help police piece the story together, to contact him.
He said: “This young man was already injured when staff arrived to help him. His broken jaw interfered with his breathing and he had to be resuscitated in the ambulance so it is very serious and we need to know what happened to him and who was responsible.
“If you were at the Bugjam, and saw him in the Dance Zone or near the Live stage or any trouble in those areas we’d like to hear from you – even if you think what you know is not important.”
The man is white, about 6ft tall with fair hair and was wearing a white T-shirt.
This year’s Bug Jam, which is a VW festival, ran from Friday, July 20, to Sunday, July 22, at Santa Pod.
Witnesses can call PC Sykes direct on 01234 275334 or call Crimestoppers anonymously on 0800 555111.