Here are some pictures from our archive that we hope will remind you of carefree times in days gone by, when schools offered a chance to get on the glad rags and enjoy a great night.
Featured schools include Scoil Mhuire, Foyle College and St Cecilia’s.
From left, Emma Carlin, Marty Rodgers, Marriah Hamill and Sean McClay. (0210PG42)
Attending Friday night's St Cecilia's College formal are, from left, Emma Morrison, Jason McKinney, Conal Brien and Beth Davidson. (0210PG49)
From left, Siun Heaney, Fionn Cooper, Michaela Daly and Timothy Clarke. (0210PG48)
From left, Emer O'Doherty, Dean Smith, Karlann McDermott and Loughlain Toland. (0210PG47)