About 100 youths gathered at the party and, after several hours of drinking, police were called.
Officers wore riot gear as bottles were thrown at them.
One person was arrested for disorderly behaviour.
In Tauranga, 11 people were arrested overnight for disorderly behaviour and for breaching the CBD liquor ban.
Police said the arrests began shortly before midnight and lasted until 5am as people took advantage of the fine evening to go out drinking.
No one was hurt but police said many of those arrested ignored warnings before being arrested.
