Police informed the teenager's parents of the impending chaos, and they returned home and ensured it would not occur.
Mr Clement said while young people had to take responsibility for keeping themselves safe, adults also needed guide them to make the right choices in high-pressure environments.
"There is nothing wrong with well planned and supervised gatherings for young people. But please, as a parent, make sure you are part of your young person's life. Get an understanding of where they are going, who they are going with and help them develop their own personal safety plan if something goes wrong."
Last November, social networking sites were used to organise a gathering of about 130 drunk and disorderly youths on Auckland's North Shore, some of whom threw bottles at police.
- NZPA