Police say two men got into an argument in the area at around 23:00 on Monday 3 August.
The men then ended up coming to blows, which is believed to have been witnessed by numerous bystanders.
Guernsey Police is appealing for those witnesses to come forward with information to help the investigation.
Anyone with information is asked to contact PC 142 Hewlett at the Police HQ on 725111 or call Crimestoppers anonymously on 0800 555 111.
