It is the eighth edition of the event on the shores of Loch Ryan which raises funds for the inshore lifeboat unit.
Toploader follow in the footsteps of Dodgy, S-Club and Ben Haenow in performing at the Dumfries and Galloway festival.
A host of local acts will also take to the stage at Agnew Park this year on Saturday 19 August.
Toploader have been announced as the headline act at this year's RNLI Parkfest in Stranraer.