Police arrested five people – four men and a woman – following the bust up in the Roe Park Resort in Limavady.
The PSNI say officers received reports of an altercation at the premises involving a number of people at the hotel shortly before 12.30am.
In a statement the PSNI said: “Three males were treated in hospital for their injuries that are not believed to be life threatening.
“The suspects-four males aged 24, 27, 37 and 39 and a 36-year-old female have been arrested on suspicion of a number of offences.”
The PSNI say detectives are trying to establish the circumstances surrounding the incident.
They are appealing for witnesses to come forward with information to detectives in Coleraine on the non emergency number 101 and quote reference 19 13/09/18.
Roe Park Resort said it was aware of and incident and police were investigating.