The majority of Parkvale School's centenary celebrations were too big to be held at the Hastings school over the weekend.
Principal Mark Gifkins said former pupils had flocked from throughout New Zealand, with some travelling from Australia.
"It's a fantastic occasion with huge attendance from all of our past and present pupils," he said.
He said the turnout could have been because children's primary school years were very special.
"Listening to the stories last night: the teachers they remember, the friendships they created at that time, I think that primary school is the one they all love and they all cherish," he said.