"They are great environments for the audience and there will be a great sound system, some great acts and a very professional show all round," McGlashan says.
So what made McGlashan, guitarist David Long, drummer Ross Burge and Alan Gregg, bass and vocals, get back together after all this time?
Gregg has been living in London, writing music for children's TV on the BBC; McGlashan is still producing plenty of material for himself and others and has been working with Long; and Burge has been playing with the Dave Dobbyn band. "We've all stayed in touch with each other over the years and this [reunion] all started about two years ago, so this has been a bit of time in the making," says McGlashan.
"We also felt that we had those nice round numbers coming up [20 years since their debut and 10 since the last gigs].
"We have all got other things to do outside of this, but thought it would be an ideal time to get together again." It's never been about money for any of us, though. And while Mutton Birds will be a different animal now, it's still the same people with the same values. And even though some of the songs we haven't played for a while I'm sure there will be quite a bit of a sing-a-long once we start playing."
It helps when you've got a catalogue of classic songs that virtually everybody knows and can sing along to.
"We started a band because we wanted to make really good music that people would still like to have in their record collections 20 years later," McGlashan says.
"We didn't do it to make money or get famous, just to write songs that people would remember.
"It's nice that you say we've done that."
They certainly have though, and Mcglashan says Wigmore and Avalanche City are both writing songs that will be remembered in years to come.
"I didn't really know Gin or Avalanche City before we decided to do this, but since we've been doing promotion together I've found they are all great people and great talents. I'm pretty sure we will all get up and do a song or two together at the shows," McGlashan says.
"I've never been [to a Winery Tour show] before and New Zealanders are really embracing this sort of festival. It's a great opportunity to listen to some good music and have a great time in a pretty relaxed setting."
And where else would you get pre-schoolers dancing in front of the stage with people in their 60s?
"Wow, is that what happens? That's amazing and shows what sort of event the tour will be. Music appeals to all ages and that's a great illustration."
