Earlier in the week, Wellington filmgoers were agog to have Peter Jackson introduce the preview screening of District 9 at the Embassy. Later this month, there's free tickets to a teaser screening of Avatar. See the first 15 minutes for free. Details here.
On a more esoteric note, there's an NZ Open Government Barcamp. This informal unconference is free and at the end of August at the National Library near Parliament. Do your bit to help goatse the government. It's got to be public good for ya.