Just for you Sayra...
"In 1971 the Labour shadow minister of MÄori Affairs, Matiu Rata, introduced a private members' bill to make Waitangi Day a national holiday, to be called New Zealand Day.
After the 1972 election of a new Labour government under Norman Kirk, it was announced that from 1974 Waitangi Day would be a national holiday known as New Zealand Day. The legislation for the change was supported by the National Party, because National wanted to shift the focus away from Treaty of Waitangi problems.
For Norman Kirk, the change was simply an acceptance that New Zealand was ready to move towards a broader concept of nationhood. Diplomatic posts had for some years marked the day, and it seemed timely in view of the country's increasing role on the international stage that the national day be known as New Zealand Day. At the 1974 celebrations, the Flag of New Zealand was flown for the first time at the top of the flagstaff at Waitangi, rather than the Union Flag, and a replica of the flag of the United Tribes of New Zealand was also flown.
The re-election of the National Party in 1975 led to the day being renamed Waitangi Day, as the new Prime Minister, Robert Muldoon did not like the name "New Zealand Day".'"
Since Muldoon is now dead, how about changing it back to New Zealand day?
http://en.wikipedia.org/wiki/Waitangi_Day