Ms Sanders said she was hoping for an audience of 5000 but that would depend on the resource consent.
The support acts will be former Opshop frontman Jason Kerrison and Herbs, the legendary reggae band that made their name in the 1980s with songs protesting nuclear testing in the Pacific.
Herbs and UB40 first played together in 1980, during UB40's first visit to New Zealand, and again at the Sweetwaters Festival in 1983.
The other shows in the Red Red Wine Vineyard Tour will be in Hawke's Bay, Rotorua, New Plymouth, North Canterbury and Auckland.
UB40's line-up was unchanged from 1978 to 2008, when frontman Ali Campbell left the band. He was followed shortly afterwards by Mickey Virtue and by Astro in 2013, when the trio got together again under the original name.
Their best-known songs include Red Red Wine, Cherry Oh Baby, Kingston Town, (I Can't Help) Falling In Love With You, their cover of I Got You Babe, and Rat in Mi Kitchen.
The name UB40 refers to an unemployment benefit application form.