Ms Dwyer said one of the major events will be the unveiling of the school's World War I roll of honour.
"The school has had a World War II roll of honour but not one for World War I."
The roll will be unveiled by Mr Borrows and the daughter of one of the men on the roll.
Ms Dwyer said the reunion would be a chance to celebrate the school's history and to farewell it for the final time.
"It will be bittersweet for everyone," she said.
The bulk of the organising for the reunion was done by Bruce Fowlie and Nigel Scown.
"Usually it takes several years to pull a reunion together but these guys have done it in less than a year," Ms Dwyer said.
It's too late to register for the dinner, but Ms Dwyer said people who wanted to attend the Saturday festivities at the school were welcome to turn up on the day, although there will be a cost for the lunch.