Essex Police want to talk to two men in connection with a serious assault at Chelmsford racecourse.
It happened shortly before 10pm on Saturday, September 30.
The victim, a man in his 50s, was assaulted as he left the venue and suffered serious head injuries. He's since been released from hospital.
Police are asking anyone who recognises the men or has any information about the incident to contact Detective Constable Richard Newton at Chelmsford police station on 101 or Crimestoppers anonymously on 0800 555 111.