The young entrepreneurs have been developing their products through the Young Enterprise Scheme (YES) since February.
YES is a business programme developed by the Lion Foundation Young Enterprise Trust that gives students the opportunity to create products and form their own companies.
Twelve schools from around the region as well as Queen Charlotte College from Picton were selling products on the day.
Westmount School students Dion Hamilton, Finley Beatson and Seddon Smith had sold 30 boxes of their product Tocal, a giftbox with foods from local producers: Pics Peanut Butter, Moutere Fruits and Mountain Valley Honey.
"It's a good start to a business and it gives you the ground basics of what business is, even though it's small. It helps you into the business world because we're leaving school at the end of this year and wherever we go it's going to help us," Beatson said.
"It contributes to a broader knowledge of business and we've encountered challenges that we've had to get over along the way."
Waimea College students created Pocket Puncher, a slim portable hole punch that sat in folders or books.
Chief executive Alana Stilborn said she recommended the scheme to other students.
"We've had a lot of support and it sets you up for the future, I didn't know what I wanted to do after school until I did young enterprise, and now I know I want to do business so it really opens doors."
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