Police say new powers will help them quickly stamp out booze-fuelled disorder during the Wellington Sevens.
Inspector John Spence, operation commander for the event, said the new Sale and Supply of Alcohol Act placed greater responsibility on those serving alcohol to intervene when people became drunk.
Police could also issue infringement notices for a range of offences, and evict people from the stadium.
Mr Spence said as in previous years, security at the stadium will check fans are not smuggling alcohol into the event.
Wristbands allowing people to buy and drink alcohol will be removed from anyone found to be drunk.