More than 400 people turned back the clock to share memories of the days when flares and platform shoes were last in fashion.
The school, which cost £1.4 million in the 1970s, closes next week and will reopen on 1 March in a brand new £14.5 million building nearing completion on the campus.
The first head teacher, Don McGregor, summed up the feelings of those who taught and learned their lessons there.
‘In a way, it is sad.
We had some fun in the school and it was a fantastic school,’ he said.