Rainey Endowed is calling on all past pupils to help the Magherafelt school celebrate its 300th anniversary.
As part of the celebrations there will be musical extravaganza in the Grand Opera House, Belfast, on October 18.
The show 50 Shillings And A New Suit Of Clothes will be directed and produced by a past pupil of the school, Ashley Fulton.
The title comes from a phrase coined by the school's founder, local merchant Hugh Rainey, and refers to the provision made for boys when they left the school as they walked into the next chapter of their lives with a sum of money specifically designated for an apprenticeship.
Margaret Hamilton, who is on the Rainey 300 organising committee, said: "It is hoped to involve as many as possible of those past pupils who were active members of choirs and the music department when at school. The core of the show will be a massed choir involving both past and present pupils.
"The organisers of the Rainey 300 celebrations invite those past pupils with an interest in music and drama to get involved in this exciting production."
The show will feature items that will be performed by the massed choir, soloists, instrumentalists, actors and some guests who now work professionally within the performing arts industry.
She added: "This is an opportunity for past pupils to perform pieces of music selected from all musical genres including classical, traditional, musical, theatre and rock/pop as well as some original songs written for the occasion.
"Involvement in 50 Shillings And A New Suit Of Clothes is a unique opportunity to share in celebrations to mark this significant moment in the history of the school."
Any past pupils interested are invited to the next choir practice in the school on Saturday, March 9 at 1pm.