"I'll be backstage with the boys there. I was talking to (lead singer) Matiu and he said come up and enjoy the show. It'll be a hell of a festival. They've made history there and so they should. They've been working bloody hard. You don't see all their behind the scenes stuff," he says.
"If there's ever a band that's worked hard to get where they are now, it's them. I'm hugely proud of them."
Matenga has finished the first year of a two-season deal with the Steamers and even though there is no semifinals place this weekend, he's not disheartened by some aspects of how the side went.
"I thought our forward pack was pretty dominant all year. Your performance as number 8 is always better when your forward pack is going forward," he says.
"In our tight five Kane Le'aupepe and Baden Wardlaw were outstanding and when your scrum is going forward you can look like a million bucks from the back of the scrum and I managed to get a few ball carries and a few good performances there, which was enough."
A self-styled rugby gypsy who'll have to compete with Akira Ioane for game time at No 8 in the Maori All Blacks, Matenga isn't overly optimistic about getting any more Super Rugby action though.
"You've always got a chance if you're playing in the Mitre 10 Cup, but I don't know how many contracts are up for grabs," says the player who doesn't even have an agent these days.
"They tend to sign these young punks on five-year deals straight out of school these days, so there's not many contracts on offer. But there's always injuries with the brutality of the comp, so yeah, I'm available, but it's always nice to have an off season in Mount Maunganui."