He suffered brain injury after an aneurism in 2006.
He said the awareness picnic is about changing people's preconceived ideas about brain injury sufferers.
"We are just normal, everyday people - you wouldn't even know."
Brain Injury Association Northland liason officer Vikki Herdman says it's the second picnic and the association hopes to make it an annual event.
"I think every opportunity we have of creating awareness is important. We [New Zealand] have the most brain injuries per capita of the developed world and if we can increase education and awareness around it, that's good," she said. "It's just getting everyone to think for a day - that's what it's about."
Symptoms of brain injury include extreme fatigue, cognitive difficulties, memory problems, sensory disabilities and personality changes.
An AUT study late last year found the number of New Zealanders with traumatic brain injuries has reached epidemic levels, with a new injury occurring on average every 15 minutes.
The research, published in November in international medical journal The Lancet, found most were due to falls (38 per cent), followed by mechanical forces, transport accidents, and assaults.
The picnic goes from 11.30am to 2pm on September. It is a gold coin donation entry, which goes to the Brain Injury Association Northland. Tables and chairs will be provided.