The event, now in its fifth year, has been expanded to a three-day festival, and a range of ticket types - including children's concessions, camping passes and family tickets - have gone on sale. The headliners are the first acts to be confirmed, with more to follow.
A Gwyl Gardd Goll spokesperson told the Daily Post newspaper: "Around 1,000 people attended last year's afternoon event, hosten in its new setting at Y Faenol estate, near Felinheli, Bangor.
"Gwyl Gardd Goll will impress those seeking an affordable cultural weekend event for people of all ages to enjoy, as well as alternative music lovers. The festival has organised a glittering weekend lineup, and is over the moon to annouce this year's headliners."