Mr Hewett said anyone who sees inappropriate or threatening behaviour at a sports match should alert team officials.
"Parents and caregivers should lead by example, by being enthusiastic but remembering this is a game, and everyone is there, including the referees and coaches for the growth, development and enjoyment of the children and teenagers," Mr Hewett said.
Meanwhile, the Auckland Rugby Union's independent judicial committee met last week to review the abandoned match between Otahuhu College and Tangaroa College under-15s.
The panel ruled that the referee was justified in calling the match off and that neither teams would receive competition points.
A fine was imposed on both teams, which is refundable if specific conditions are met.
Auckland Rugby Union chief executive Andy Dalton thanked the police for their support in dealing with the matter.
"It was an unsavoury incident that took place and one we hope not to see again," Mr Dalton said.