Waitangi Day 

(named after Waitangi, where the Treaty of Waitangi was first signed) commemorates a significant day in the history of New Zealand. 

      It is observed as a public holiday each year on 6 February to celebrate the signing of the Treaty of Waitangi, New Zealand's founding document, on that date in 1840. 

       In recent legislation, if 6 February falls on a Saturday or Sunday, the Monday that immediately follows becomes a public holiday