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Police are asking people who witnessed an unprovoked assault at a concert on the lawns behind the De La Warr Pavilion, to come forward.
It happened at around 10pm on Saturday, September 9.
The victim was knocked to the ground by someone unknown to him and then kicked by the suspect and a second man, who both then left the scene.
He was taken to hospital for treatment to a serious facial injury.
The area was busy with people at the time of the assault and officers are keen to speak to anyone who saw what happened.
Anyone with information is asked to report online or by calling 101 quoting serial 832 of 11/09.