Gibbston Valley Wines Ltd chief executive Greg Hunt said just over 13,000 of the available 15,000 tickets had been sold, including many to Canterbury people.
Construction at the site, on State Highway 6 east of the Gibbston Valley Winery, began on Monday with about 50 people erecting marquees and a massive stage, custom-built in Christchurch for the concert.
"We have a great group of contractors who have all the necessary ... equipment."
Rumours had been circulating the concert would be cancelled because of a lack of availability of portaloos.
However, Mr Hunt said that was not the case and toilets had been sourced from all around the region and were on site.
The February 22 earthquake in Christchurch had made it "more difficult" to finalise details for the concert, "but we're now in a position to go ahead".
The specially-built stage was under construction in Christchurch when the earthquake hit, but it had been completed over the past week, transported to the venue, and was now in place and ready for action.
Dean Calvert, of Christchurch, said Cantabrians involved in the concert had been "incredible", constructing "90% of what's been put together" while at the same time trying to deal with broken homes and hearts.
Mr Hunt said while a few people from Christchurch had cancelled their trip south, many more had called wanting tickets.
"A lot of people are saying they're looking forward to getting away and having a break."
Saturday's concert would be "the first of many" at the venue.
Mr Hunt and Alpine Entertainment Ltd were already discussing who would headline next year.
Alpine Entertainment Ltd spokeswoman Amanda Calvert said parking would begin on-site at 10am, with gates opening at noon.
The Station Agents would take the stage at 1.30pm, with Dr Hook scheduled for 3pm and Creedence Clearwater Revisited at 5pm.
Ticket holders could bring their own food and non-alcoholic drinks to the concert, along with picnic blankets and chairs.
Mr Hunt said umbrellas would be permitted, but asked people to be "mindful" of others.
Wine and beer would be sold at the concert, along with Central Otago wine spritzers.
Collectors would also be circulating through the crowd on Saturday, raising money for the Christchurch earthquake appeal.
