A keen rugby player in his youth, Williams began his caddying career early: he left to join the professional circuit in Europe aged just 15.
In the nearly four decades since, he has caddied for some of the biggest names in world golf, including a 13-year stint as Tiger Woods' right-hand man.
The American dominated the sport during that period.
After the day's competition at Arikikapakapa, Williams will host an evening Q&A session and auction at the course's clubhouse.
One item going under the hammer will be a winning Masters flag belonging to Scott, the Australian former world number one.
More than 20 teams are set to take part in today's tournament, with competitors teeing off from midday.
An activity at the 18th hole will see Williams hit a drive in any direction, with a $100 prize for the person who can get their ball closest to his.
The chamber's annual golf day is further evidence of the close relationship between business and golf.
Executives are known to chew over tricky deals out on the links and the sport is the "martini lunch of the modern workforce" according to Golf.com.
Walsh said he did not play golf himself, but understood why the sport held such an appeal for the business community.
"I think there is a lot of business done socially - on the golf course, or on the fishing charter," he said.
"It's a way for business people to relax, but also talk to like-minded people.
"I'm sure that will be happening tomorrow."
