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.
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ON A HIGH...The 25 year group pictured during the Coleraine High School Reunion Dinner at the Lodge Hotel in 2008. Photo: NI WORLD
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REMEMBER WHEN...Mrs Doris Hutchinson (right) former headmistress pictured with past pupils Deborah Mairs, Melissa Hartin, and Ruth Rock during the Coleraine High School Reunion Dinner at the Lodge Hotel in 2008. Photo: NI WORLD
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FRIENDS...Maxine Hamill, Victoria Hamill and Alison Duffin pictured enjoying the Coleraine High School Reunion Dinner at the Lodge Hotel in 2010 Photo: NI WORLD
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MEMORIES...Jennifer McQuillan, Jane McCreery, and Carolyn Pauley pictured during the Coleraine High School Reunion Dinner at the Lodge Hotel in 2010 Photo: NI WORLD