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People are being given the chance to perform alongside the likes of UB40, The Libertines and Soul II Soul.
Medway's UK City of Culture 2025 bid and Rochester Castle Concerts are offering 'Medway 2025 Homegrown Sets' at this summer's event.
Local talent has been invited to perform at the show, taking place between July 8-10, to demonstrate why Medway deserves its moment in the national spotlight.
Artists who think they have what it takes to warm up audiences are encouraged to post a sample of their work on the event's Facebook page.
Successful applicants will be awarded one of a limited number of slots. The local musicians will be billed alongside the headliners and special guests.
In the year Medway prepares its bid for submission, the programme of sets from up-and-coming artists in the castle grounds makes a statement about how the contemporary and historic complement one another in Medway and the area's potential as a cultural destination.
Michael Oyar, hip-hop artist and Medway 2025 Trustee, said: "Medway has such incredible and diverse music talent and we are raring to flex our creative muscles in front of live audiences once more as Medway prepares to submit its 2025 bid.
"The 'Medway 2025 Homegrown Sets' at Rochester Castle Concerts are about making a statement that Medway deserves its place on the national stage.
"As a trustee I see the huge opportunity the Towns' have to change our reputation, create opportunities for local people and show off what we can do and what our message is to the rest of the UK.
"We want to give locals a moment to be proud of."
Organiser of concerts Adrian Gibson said" "The concerts are a big part of Medway's summer calendar and we cannot wait to welcome people back to the castle grounds for some lively events. We are huge supporters of Medway's ambition to be UK City of Culture in 2025.
Tickets for Rochester Castle Concerts can be purchased here.
To find out more about the bid and how to show your support follow @Medway2025 on social media or visit the website.