Since its humble origins as a one-day lineup of folk-rock bands at WestWorld, the McDowell Mountain Music Festival – now known as M3F – has evolved into the Valley’s premier homegrown live-music event. And the 2020 lineup – unveiled this morning by festival founder John Largay – is its biggest, and arguably most star-studded yet. 35 recording artists will perform March 6-8 at Margaret T. Hance Park in Downtown Phoenix, including indie-folk superstar Bon Iver, Aussie synth-rockers...