Mrs Harding even took along face paints and offered her freshly bald bonce up as a canvas to would-be graffiti artists - for a price.
"Obscenities are allowed," the village's manager and the evening's MC, Graham Tiplady, gleefully announced.
"If they're willing to pay, I'm willing to do it," said Mrs Harding.
Aged 79, she, her husband Peter, 83, Val and Henry Cobald, 82 and 87, and Ken Barber, age not shared, were the five who gave up their hair for the cause.
Mrs Cobald thinks this might be the last time she agrees to have her head shaved. "I'm worried it might not grow back one day," she said.
Up at the Falls, they're wondering if they've set an age record for the Leukemia Foundation's 2014 "World's Greatest Shave".
A few years ago when Project Promise was launched, everyone at the retirement village worked so hard they raised a staggering $11,500 toward the building of an oncology unit at Whangarei Hospital, Mr Tiplady said.
"We'll give anything a good go here," he said.