Mrs Siers said the Saturday event will be modernised this year with the addition of a market day "with a bazaar twist" and stalls offering a variety of refreshments, from lemonade and coffee to high tea and berries and cream.
There will be about 25 stalls at the bazaar, she said, which will also offer a range of merchandise and produce including Solway College memorabilia and a children's book, Allis the Little Tractor, written by her daughter, Sophie Siers.
The book, which was illustrated by Helen Kerridge, is about an Allis Chalmers tractor that will also tie in, Mrs Siers said, with a Wairarapa Vintage Machinery Club fleet of vintage tractors that will form an honour guard at the centenary event.
Mrs Siers is herself an author who published a history of the college titled We Built a School: Solway College, a pictorial history, 1916-1991.
The Solway College Centennial Bazaar will run from 1pm to 5pm on Saturday, February 6.
Veteran singer-songwriter Andrew London is the headline entertainer during the weekend and alongside his band, The London Derrieres, will entertain at the Solway College Centennial Dinner and Dance on the Saturday night.
Other centenary events will include a re-enactment, based on a surviving photograph, of the opening ceremony of Solway College, which was in 1916.