"Traditionally we would have a large number of international students and backpackers on our books, which isn't there at the moment."
He was putting the word out asking for workers for the weekend.
For a day like Saturday they would normally have about 1000 people working in some capacity in the stadium, but he believed they would be down 10 or 20 per cent.
"We do ask people coming to the stadium just to be patient and kind to all staff who are doing their best," he said.
"The main thing that fans can do for this game is to arrive early."
He recommended people show up about 90 minutes before the game starts so they could be sure to be in their seats by kick-off.
The stadium has 34,500 seats and would be at capacity this weekend.
"This is the first full house we've had in three years."
Harmon expected understaffing to remain a problem for some time, as Covid 19 and other illnesses sweep through the community and hamper international travel.
But he and other organisers were excited for the coming match regardless of staffing woes.
"It's the most anticipated rugby match, I think, in years at the stadium."