Nigel Cass, New Zealand Rugby general manager of the upcoming Lions series, said the event would have special significance for the visitors and locals alike.
"New Zealanders pride ourselves on our hospitality to international visitors and the event at Waitangi will prove a unique and fitting welcome for the visiting British & Irish Lions," he said.
"As well as welcoming the team, we're also very grateful to Waitangi Treaty Grounds for opening the event to visiting fans and locals. It will make for a truly incredible atmosphere and is set to be a highlight of the series."
British & Irish Lions tour manager John Spencer said the team viewed the welcome at Waitangi as an important introduction to New Zealand's culture and traditions.
He said it would be a "moving experience" for all members of the tour party.
"Being culturally prepared for our tour of New Zealand is important to us and something we intend to embrace by sharing some of our team's cultures, whether it be in English, Welsh, Scottish or Irish," he said.
Gatland named his 41-strong squad on Thursday, naming Welsh flanker Sam Warburton as his captain.