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The memorial tree is the last physical reminder of the former primary school that closed in 1969.
Organiser of the weekend’s get-together Nanette Linklater said a reunion had been planned for the past two years but Covid-19 had got in the way.
Up to 40 former pupils now lived in Australia, and many more lived in Auckland, so numbers were lower at the weekend than she had hoped.
Mrs Linklater said the school held a special place for many former pupils.
The school that operated from 1932 to 1969 on the site where the University Union now stands had created a community in its day.
"A lot of our mothers and fathers went to this school, my mother did," Mrs Linklater said.
The more than 20 former pupils who gathered at the memorial tree over Labour Weekend attended between the years of 1954 and 1967.