The alleged assaults took place at an evening event and there were reports of heavy drinking, even though some were too young to consume alcohol.
Labour MP Liz Craig was at the Waihi summer camp, but was asleep when the alleged offending took place.
Prime Minister Jacinda Ardern had spoken to the group earlier that day.
Labour's hierarchy had failed to tell Ardern about the scandal and there were complaints about the handling and the failure to refer the issue to police at the time.
Ardern said at the time there were parental consent forms, but they did not protect the young people at the camp - which is why Young Labour would not be running the camps in the future.
The Austen report recommendations include:
• To develop a more tangible and effective relationship between Young Labour and the Labour Party
And to review and/or develop policies on:
• The party's code of conduct – along with consideration as to whether that should apply to the Young Labour Party, or whether a modified or separate code should be developed
• Sexual harassment & sexual assault
• Alcohol
• Events and host responsibility
• Bullying
• Complaint procedures
Austen's report also identified the need to:
• Incorporate updated event registration and parental consent & risk disclosure information requirements and forms to ensure compliance with current best practice and all legislation relating to the care of minors when participating in party-held events.
• Ensure at least one Labour Party representative should also attend the entire event and be available throughout (solely or jointly with another nominated adult supervisor) to ensure compliance with safety and welfare expectations and the Young Labour Party should also nominate a welfare officer to attend all events.
• Introduce a new, over-arching alcohol policy, formulated in consultation with expert external advice
• Introduce a new open complaints process to enable complaints to be received and responded to without delay and with the appropriate degree of specialist advice.