The children attended two communal music-making sessions, at Wakari School on Thursday and St Clair School yesterday, to practise their instruments and learn new songs.
Music Education Otago secretary Alison Caldwell said the event followed on from a ukulele workshop for teachers last year.
The instrument had gone through a revival, largely thanks to the Wellington International Ukulele Orchestra, and groups and schools around town had started using them.
While they would never replace the recorder, ukuleles were a great option for schools because they were relatively cheap, easy to pick up, and teachers could learn with their pupils, she said.
"The ukulele is an instrument that appeals to young and old, and most people that try it end up hooked."