There’s no question about it – the big cultural event of the weekend in our region in Freshgrass, a three-day festival of roots and bluegrass music at MASS MoCA in North Adams. The lineup is stunning, really a who’s who of traditional and progressive bluegrass as well as country and roots music. At the top of the list is the unparalleled Emmylou Harris, who was born to sing bluegrass and country music, given her voice’s innate high lonesome sound. Also on the bill are the Carolina Chocolate Drops, Railroad Earth, David Grisman Sextet, Béla Fleck & Abigail Washburn, Valerie June, Rodney Crowell, Aoife O’Donovan, Sam Amidon, and the Infamous Stringdusters. Other performers include Sam Bush, the Gibson Brothers, Alison Brown, Valerie June, Michael Cleveland, Claire Lynch, Darol Anger, and Martha Redbone Roots Project. All told, the event promises to be a kind of all-star festival of American country and roots music. That’s Freshgrass at MASS MoCA – today through Sunday.