The comedian, who has over 38,000 Instagram followers, visited the region in 2019 and said he was really taken with the place and the people.
"I've got some very vocal and supportive Facebook fans in the area as well so will hopefully be meeting some of them on the night of my visit," he said.
After years of mimicking various New Zealand celebrities and stereotypes on his social media platforms including politician Paula Bennett and Gingerbread the Cat the "Snapchat Dude" decided to collate his favourite personalities into a book.
Having admitted that he is completely obsessed with human psychology, Sainsbury said humans are entertainingly flawed.
"I've spent a lifetime watching the people that populate this fair nation and boy, there are some wonderful characters out there," he said.
In this book is a comprehensive array of Kiwi heroes and heroines including the useless farmhand that is forever jack-knifing the trailer, the martyr mother who guilt-trips her children and the officious office worker who narks on the rest of the staff for a low level misdemeanour.
Friday's meet at the Common Room with Sainsbury is free entry.
For any more information or Covid-19 updates about the event you can go to Wardini Books' Facebook page.