The festival started yesterday afternoon, attracting a near sellout crowd to Forsyth Barr Stadium.
It continues today at noon and all 6000 tickets have been sold.
"We love Dunedin, so we like coming down for the festival. Love the locals, love the vibe."
The couple flew down to Nelson to attend the New Zealand Cider Festival, before getting on the road to Dunedin, Mr Oliver said.
People’s enjoyment of the festival and the well-run nature of it all kept them coming back.
"It's probably one of the best beer festivals in the South Island.
"[I’ve] done most of the ones in the South Island over the years, but this is definitely by far the busiest and the best."
The brewery is based in Wānaka.
Quick Brown Fox Coffee Liqueur, which is based in Dunedin, has only missed the festival once.
"Ever since then we've been coming.
"It's been really cool to see it grow into such a popular event. It's probably one of the best events in the country. I love that it's under cover. Punters are always in a good mood."
"They've come back. So it feels really kind of full. Like everyone's back, which is really nice."
There were a few new additions to this year’s festival, which included a champagne and oysters vendor and whitebait fritters, Mr Schroeder said.