Waitangi Day is the national day of New Zealand, and commemorates the signing, on 6 February 1840, of the Treaty of Waitangi. Ceremonies take place at Waitangi, Northland to commemorate the signing of the treaty, which is regarded as New Zealand’s founding document. The day is observed annually and is designated a public holiday, unless 6 February falls on a Saturday or Sunday, when the Monday that immediately follows becomes the public holiday.