Sou'westers vocalist and songwriter Aly Cook said the group - whose members are from Nelson, Hokitika and Christchurch, including Dean Hetherington from the Coalrangers and Kiwi rock and alternative country music master Liam Ryan Liam - were thrilled to be invited north for the event.
"It's good to be here in this fantastic place but what was really special about arriving was the powhiri for the performers last night," Ms Cook said. "It was a great way to be welcomed to the land, and great musically, too.
"It's nice to be back in Northland."
The Sou'westers all-original album Going West sat on the New Zealand Music Charts for six weeks last year and the band recently performed in the Australian Gympie Music Muster.
By early afternoon, about 200 people were enjoying the friendly, slightly low-key atmosphere, with a choice of outdoor seating or shade in the huge marquee.
Although the change was not widely advertised, the organisers decided at the last minute to lower the ticket price from $85 to $50 for people arriving after 5pm.
"It's a work day for most people. We know most won't arrive until after then, and we expect it to be really lively after that."
Ms Colvin said she was thrilled with the response from legendary New Zealand country musicians when she put out the idea for the "by locals, for locals" festival.