Organiser Kylie Wech said the charity uses local community and school groups on the night as helpers.
"Their time is valued and donations are made to multiple groups, such as Hurupaki School Parent Support Group, St John and Hatea Lions," she said.
The event has gained so much traction in the past few years that they've had to turn people away.
"We have the biggest fight card yet, consisting of 17 fights," Wech said.
There were a few well-known names and tickets had sold "like mad".
Among the combatants are Bronson Murray (rugby), FitMin's Corinne Austin, Miranda Harrison from Activ8, and police officer Doug Te Puni.
"This year has been a record for corporate tables. When I took on the event three years ago, I sold 42 tables, last year was 46 tables and this year is a sell-out of 50 tables," she said.
"I do not pre-sell general admission as I would have to give up my day job to do so, but the inquiries have been so significant this year that I have changed the configuration of the bleacher seating to accommodate another bleacher."
An event like this doesn't come off the back of one person's effort. Wech said Stainless Steel Products' Joe Pitman had stepped up and made a big difference.
"Joe has a boxing background and a passion for the sport. Joe has been organising the match-ups and making sure people are training and that the weights, among other things, stay within the New Zealand Boxing rules for corporate fighting," she said.
NZ Boxing sanction the fights and send a team of judges, referees and timekeepers from Auckland for the event.
Contractors for Charity fight night is on tonight at Kensington Stadium. Doors open at 5.30pm.