Chris Jacobs will perform American roots music beginning at 6:30 p.m. Saturday at Flat Iron Crossroads, 7709 Flat Iron Road, Gloucester. He is known for a soulful, elastic voice that brings both fire and finesse to the stage as he “weaves rock, soul, Americana, and funk into a sound that’s as dynamic as it is heartfelt,” a release stated. Tickets are $20 in advance, available online at flatironcrossroads.com....