The Auckland event is a sister show to those in Germany - considered the largest equine trade event in the world - and Melbourne.
Competition in showing, eventing and dressage will be a highlight and some of the biggest names in the sport are expected to be confirmed in the coming months.
"I'm really looking forward to coming back to New Zealand and being part of the action," six-time Olympian Nicholson said.
"It promises to be a unique and exciting event, and a great opportunity for me to thank equestrian fans in person for their messages and support."
A nine-time winner of four-star classic events, Nicholson has been engaged in a standoff with Equestrian Sport New Zealand since an incident at the world games in 2014 where he had an altercation with a New Zealand team vet.
Attempts to broker a peace accord between Nicholson and ESNZ have failed and it may be his days of representing New Zealand are over.
But the former world No 1 rider proved at Badminton he remains one of the great three-day eventers.
The show runs from November 23-26 and will be staged at the ASB Showgrounds.