Auckland is surely the less New Zealander town in New Zealand but, on the other side, is the place hosting all the major events.
Periodical, events: The Santa Parade, before Christmas (pretty unusual scenario for people coming from the Northern Emisphere) Several different New Year celebrations. Together with the “classical”, there are also the Spring Festival, ending with the Lantern Festival and the Matariki(Māori New Year, an entire month between June and July).
More or less serious racing events: The Red Bull Trolley Grand Prix, a novelty downhill race for unpowered vehicles.
World Rally Championship 2012. NZ round is back in Auckland after two years.
Magnificient, extraordinary, unique events: The Rugby World Cup 2011, set by Kiwis for the very first time in 24 years.
The Volvo Ocean Race, sailing around the world, back in Auckland after 10 years.
You will read more about those events in the dedicated pages.