The Bruce Katz Band will perform its own blend of blues, “soul-jazz,” New Orleans-inspired roots music and “jam/blues” beginning at 6:30 p.m. Saturday at Flat Iron Crossroads, 7709 Flat Iron Road, Gloucester. Doors open at 5:30 with food from the Shore Bites food truck and beer, wine, and soft drinks at the FIX Bar. Tickets are $20 in advance, available online at flatironcrossroads.com, or $25 at the door. Children 12 and under attend free of charges. Organist and pianist Bruce Katz has performed as a member of Gregg Allman’s band, Jaimoe’s Jasssz Band, Butch Trucks’ Freight Train Band, and Les Brers. He has also occasionally toured with the Allman Brothers. Trained in classical piano from age 5, Katz earned a Master’s degree in Jazz Performance from the New England Conservatory of Music and taught at the Berklee College of Music for over a decade. In 2019, Katz won the Blues Music Award for Best Acoustic Album for “Journeys to the Heart of the Blues” and has been nominated for the BMA...