The concert was moved to the newly refurbished Western Springs Bowl from Spark Arena due to high demand.
Venue owner-operators Auckland Stadiums and Tātaki Auckland Unlimited have both been approached for comment.
Herald entertainment reporter Mitchell Hageman said after 20 minutes of no action, the crowd remained in relatively good spirits but were getting slightly frustrated, taking the opportunity to go to the toilet and grab a drink.
“The crowd around me is fixated on security trying to catch a gatecrasher.”
But as the wait neared 40 minutes, the crowd started to grow restless.
“I’m disappointed. She sounded fine for the first three songs, so I don’t know why she’s gone off,” one concertgoer said.
“If they cancel, I hope they refund everyone.
“I feel like even if they go on with the show, it’ll be rushed because of the curfew. It’s such a disappointment.”
Another said: “How hard is it to plug something in and out again?”
It’s understood that the event has a curfew of 11pm.
When Dean finally reemerged, she apologised for the delay.
“I’m so sorry about that, everybody. Thank you for waiting,” she said.
“That’s never happened before.
“Thank you for waiting, everybody – we’re still going to have a good evening.”