The annual operational cost of the rescue helicopter, which transports about 320 people a year, is $2.5m and the trust has to fundraise half of it.
Chief pilot Charlie Beetham said transportations like one in October last year would not have been possible without the funds raised by the annual Cocktail party which raises an outstanding amount of money to provide top-of-the-line equipment.
Last year Mr Beetham helped rescue a group of trampers who went missing in the Ruahine Ranges in severe weather.
He made four trips in the treacherous weather to rescue eight people including hypothermic trampers and LandSAR members.
"Rescues like this take years of training, robust procedures and lots of money," he said.
The annual event also had an online auction which opened last night and will close on Sunday.
Another hit for the second year was the 'Pop the Magic' en masse popping of helium balloons for prizes with the biggest being a ride in the rescue helicopter.