"People just need to have a conversation," she said.
The beach is part of a 48ha "Whenua Rangatira" block, including the reserve behind the beach where the tribe once lived and Bastion Point above the bay, which was returned to Ngati Whatua in 1991 under the Treaty of Waitangi. It is managed jointly by the tribe and Auckland Council through the Ngati Whatua Orakei Reserves Board.
Ms Hawke said 400 to 600 people were expected when the mokopuna day was first scheduled just before Christmas, but it had to be postponed then because of bad weather and she did not expect so many people now that the summer holidays were over.
"It's a family day," she said.
She said it was the first time the tribe had exercised its right to use the beach for a tribal event, apart from "civic events" such as ceremonial canoe visits.
"It's unique in that the way they have designed the event requires the use of the land that they have asked for. It's well within their rights," she said.
"It's not the intention of the family to close out the public. It [the beach] is always accessible to the public."