The two-day show will be followed on Sunday by the Corson Wairoa Jumping Show, also at the showgrounds, the Wairoa Racing Club's annual two days of racing on February 20 and 23, and the East Coast Farming Festival back at the showgrounds on February 25-27.
The features of the show the week are the equestrian events, with Sunday's events helping attract more than 300 horses and riders, along with the annual rodeo, the sheep dog trials, and the shearing.
Gates open to the public at midday on Friday, with horse events and the dog trials under way immediately. The "local" rodeo will start at 5pm, and a Speedshear at 7pm.
Equestrian events and the dog trials continue on Saturday, with the national second division circuit Rodeo and the Wairoa Shears, which will include the first match of a Wales Development team North Island tour.
About 30mm of rain late Monday and early Tuesday will have pleased the show's rural community, but more is forecast for the two days of the show.
"We're hoping it's not a 10-year cycle," said Hooper.
In 2010 more than 80mm of rain ruined the show, most events having to be cancelled, the shearing being held in a woolshed several kilometres away because sheep and shearers couldn't get into the showgrounds and a fleet of exhibit tractors towing trucks, horsefloats and other vehicles which otherwise couldn't get out.
The show was first held as a Wairoa County Ram Fair and Show in 1899, and the show society bought the current site in 1920.