Organised by Music Education Otago, this year three jam sessions took place at Taieri College, Tahuna Intermediate and George Street Normal School.
Music educator Andrea Robertson said more than 900 children from 38 schools took part.
Strings have been strumming in unison recently at schools across the region as pupils took part in practice sessions in the leadup to the events.
"The schools prepare the songs for at least a term.
"They have been rehearsing in their lunch times and depending on if they have got a specialist music teacher, maybe in class time."
Helping provide accompaniment during the jams were local musicians Samuel Leaper, Anthony Breese, Jakira Brophy, Josh Tuiavii and Niamh Crooks.
Most of the band members were also previous ukulele jammers, Mrs Robertson said.
During some of the songs, children were invited on stage to help provide percussion.
"I think it gives these kids something to aspire to.
"Why are we doing music? Because one day we could be actually playing an instrument in a band."
This year is the 14th time the Ukulele Jams have taken place, organisers teaming up with NZ Ukulele Trust and its Kiwieles programme to help children participate in the events.
During the jam sessions, educators from the Dunedin Public Art Gallery helped pupils contribute to a combined art work.
Mrs Robertson highlighted the efforts of Music Education Otago co-chairwoman and MC Alison Caldwell. She was a huge factor in enabling the Ōtepoti Dunedin Ukulele Jams to continue to be such a successful and enjoyable event.
Music Education Otago was grateful to its funders including the Dunedin City Council, Creative NZ and the Otago Community Trust.
It also thanked sponsors Tūhura Otago Museum, Moana Pool, Lan Yuan, The Warehouse and Woolworths Supermarket.
