Event organiser and Porirua Whanau Centre Trust chief executive Liz Kelly said she was comfortable with how officials at the event dealt with the brawl.
But she said the fight could have been stopped if those people filming intervened.
"I'm disappointed that we have people in our society who have that sort of mentality that rather than helping somebody that they would think that it's more important to film it."
Kelly said the attack was the first in the 12 years she had managed the event.
"My heart goes out to the victim and to her whanau but the actual incident had nothing to do with Creekfest.
"I've been told that this is a grievance between two families and they brought their grievance to Creekfest."
Porirua mayor Mike Tana said the brawl happened as people were leaving the festival.
A group of girls attacked a defenceless teen during the Creekfest festival in Porirua over the weekend. Photo / Facebook
"It was out in the carparking space off to the side of the event.
"It did seem they were a group of young kids that knew each other and obviously something had happened and they were having an altercation that just didn't need to happen."
He said it was horrible.
"If it was my daughter who got involved or got hurt I'd be devastated."
About 32,000 people attended Saturday's festival.
Creekfest started in 2004 to raise awareness of programmes and services available in the region to achieve better health and well-being outcomes.
