Flat Iron Crossroads’ Spring Festival will be held from noon to 8 p.m. Saturday at the concert venue on Flat Iron Road in Gloucester.

The Celtic band Poisoned Dwarf will open the eight-hour concert, performing traditional tunes from Ireland, Scotland and other locales. It will be followed at 1 p.m. by Eli Cook, singing a blend of blues, rock and country.

The Good Shot Trio, offering classic vocal jazz and Las Vegas nightclub-style entertainment, will perform from 2-3 p.m., followed by the Osmosis Jazz Duo with Jacque Jones and Victor Wooten.

At 4 p.m., the Bobby Blackhat Band, featuring the award-winning vocalist, harmonica player, recording artist and songwriter Bobby “Blackhat” Walters and “Steady Rollin” Bob Margolin will take the stage at Flat Iron. Both performers have opened for major artists during their multi-decade careers, and the band advanced to the finals of the International Blues Challenge in Memphis, Tennessee.

Jackie & Resa of the M.S.G. Acoustic Blues...