Mr Marcenac said final details for the 40th anniversary ceremony were still being worked on but would be revealed on Tuesday.
"I will be up there on Monday visiting the site, liaising with the landowner and the local iwi.
"As well as Mr Thomas we have other survivors and rescuers coming, with some from Australia also," he said.
A 30th anniversary service was held at the site 10 years ago.
"For me it was an emotional day, but it was a kind of emotion that will help a man of my age to become an old man nicely, in serenity," Mr Thomas told the Northern Advocate on that occasion.
The Noumea-registered 3614-tonne cargo vessel, carrying a crew of 29 and eight passengers, was en route from Auckland to Sydney.
It was taking meat and dairy products, but a fire broke out in the engine room, directly below the lifeboats.