Former pupils and staff are among those featured at the reunions in Portrush Playhouse, Ballymoney Rugby Club and the Lodge Hotel in Coleraine.
Have a closer look to see who you recognise reminiscing about school days.

1. RETRO
Nikki Parke, Katrina Gamble, organiser Amanda Cochrane and Elaine Mann pictured at Ballymoney High School Class of 98 School Reunion held at Ballymoney Rugby Club in 2010. Photo: NI WORLD

2. RETRO
Coleraine Girls Secondary school 25 year reunion held at the Adelphi Hotel in Portrush in 2010 with a number of their teachers seated front. Photo: NI WORLD

3. RETRO
Melvyn pictured along with Joanne McMullan and Heather Shaw at Ballymoney High School Class of 98 reunion in 2010. Photo: NI WORLD

4. RETRO
Former Cross & Passion Class of '83 pupils pictured at a School Reunion held in 2010. Photo: NI WORLD