Te Taura Whiri i te Reo Maori is calling on speakers of te reo to create a gigantic Maori language zone during Te Matatini 2015.
"With thousands of speakers gathered in one place at one time, we urge those attending Te Matatini 2015 to use Maori language day in and day out," acting chief executive Poia Rewi said.
"Let's create the biggest Maori language event."
The Maori Language Commission will be distributing complimentary hats, bags, water bottles and stickers adorned with the words "Korero Maori mai - speak Maori to me".
"The invitation is to speak Maori right throughout the festival and beyond. We invite and challenge people to use te reo Maori as much as possible during Te Matatini 2015, from the powhiri to the finals, and beyond," Mr Rewi said.