Police urge Rhythm and Vines festival-goers to "take it easy on the alcohol" as stricter alcohol rules come into force following previous years' mayhem.
They are "cautiously optimistic" the changes will help stop a repeat of last year's problems which included rioting among campers at Baywatch campground.
Tairawhiti area commander Inspector, Sam Aberahama, said police were hoping for an event-free festival.
"Alcohol is by far our main problem at events like this and we encourage everyone to drink responsibly."
The festival site at Waiohika Estate was a licensed area this year and it was expected this would help control people's drinking.