An unconscious 16-year-old boy has been taken to hospital after consuming nine litres of wine in south Auckland.

Manukau Police said in a tweet that the boy was found at Manukau mall and had drunk the alcohol at home.

An ambulance communications spokesman said the boy was waiting to catch a bus when he passed out about 5.45pm.

The boy was transported in a serious state to the children's section of Middlemore Hospital.

A Middlemore Hospital spokeswoman said the boy was still in the emergency services department but was in a stable condition.

Police have also tweeted about a number of incidents at Friday's Maori and Pacific Island cultural festival.

Three intoxicated young women were turned away at the festival's gates earlier, and were taken home to explain to their parents, police said.

One youth was caught with a screwdriver and another with a hammer. They both admitted the tools were weapons and were removed from Polyfest, police said.

And a group of girls were evicted for fighting over a boy.

For the first time at Polyfest some police and security officers were in plain clothes to help blend in with the crowd, police said.

Police officers were also dealing with some minor disorder in the surrounding streets following Polyfest.

Earlier on Friday evening police issued a statement saying crowd behaviour at the event, held at the Manukau Sports Bowl, was pleasing so far.

Operation Commander Inspector Alan Shearer said in its 40th year, the event was a positive demonstration of Auckland's diverse community working together.

"It's great to see so many young people out enjoying the performances and supporting the schools who are competing," Shearer said.

Shearer said there were no major incidents at the event on Friday but a small number of people had been removed for minor disorder incidents or possessing offensive or illegal items.

The event continues on Saturday.