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Rushen Silver Band and the Musicale choir at Castle Rushen High School on Saturday will gather for a special concert.
Jim Cottier, the chairman of the Castletown branch of the Royal British Legion, said: "This is a great event for the British Legion in Castletown. It's an excellent way to celebrate the 90th Anniversary and we are very grateful to Celton Manx for its kind support of the concert.
"We will have some great music from Rushen Silver band and Musicale - as a finale we will have the usual fantasia of sea shanties, Rule Britannia and more. As you would expect audience participation is a key part of the finale so bring your flags!"
Bill Mummery, executive director of Celton Manx, said: "We are pleased to be supporting the events to celebrate the 90th anniversary of the Royal British Legion and especially to benefit the Castletown branch.
"This sponsorship is a great way for us to say thank you to the Castletown community which has supported us since our arrival in the town in 2008.
"Although we have now relocated to our new headquarters in Braddan we will continue to look for ways in which we can support the Castletown community in the future."