The society extended its horse and pony accommodation over the last year but finds itself still needing stabling at Te Kupenga Racecourse, where the Wairoa Races, the next biggest annual event in the area, will be held on February 25 and 28.
More than 300 horses and ponies will be at the Wairoa show for the dozens of equestrian events.
A special feature of the show is the Friday night programme, including the rodeo starting at 5pm tomorrow, and a speed shear starting at 7pm.
They serve as entrees to Saturday's New Zealand Rodeo Cowboys circuit rodeo and the Wairoa shearing championships, which form part of a unique showgrounds corner also featuring the show's sheepdog trials.
A farm fencing competition fills another agri-sports space, while the popular Rural Ironman for the first time includes a junior category.
The wool fleece competition remains a significant part of the show, despite having disappeared from some shows, while the home industries classes, which once reflected the knitting and cooking homestead lifestyles of the farm, are being extended to include new categories, including a children's Lego competition, scarecrow competition and men's kitchen baking.
TV personality Te Radar will perform a wide range of duties, including judging a busker competition for local musicians.