The incident happened in St Miles Alley, off Colegate, at 12.53am on Tuesday, May 23 after reports of a fight between a man and woman behind St Miles Coslany Church.
One man in his 20s was arrested in London and questioned at Wymondham police station at the time, while two other men in their 20s were arrested in Great Yarmouth on May 25.
They were all released on bail but now one of the men has had his bail extended until August 23, while two others have had their bail extended to August 25.
Officers have confirmed enquiries are still ongoing following the incident.
Following the incident, the woman was taken to the Norfolk and Norwich University Hospital (NNUH).
Detectives have previously said they believe the woman and man involved in the altercation are known to each other.
Any witnesses or anybody with information should contact DC Rob Waring at Broadland Police Station on 101 quoting investigation 36/36703/23.
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