"If you're a boy, know that raising a hand to a woman - or to anyone - is unacceptable," he said.
Lewis spoke about controlling behaviour by men towards women and children.
"It is not okay if someone wants to stop you from listening to your favourite music or watching your favourite films.
"If you're experiencing this kind of control, have a conversation with someone who can help."
There are wonderful agencies doing great work to help strengthen Whanganui families, she said.
Williams spoke about the recently launched Mana Man Facebook page and the movement which aims to transform men by changing behaviour and attitudes.
"Mana is not about how tough you are," he said.
"Mana is about being humble, about being a contributor to your community.
"Our women are our leaders and always have been."
Jigsaw Whanganui executive officer Tim Metcalfe led the males present in a chant to; "stand up, speak out and act against violence towards women and children".
Male Whanganui City College students performed a haka followed by music from Kupe Renata and Mike Connor and a performance by junior hip hop dancers Kare Krew.