CELTIC/BLUEGRASS FEST & JOHN PUTNAM FIDDLER’S FESTIVAL at the Greenfield Energy Park, Miles Street, Greenfield. Noon to 4 p.m. The festival is a fundraiser for a local family and is hosted by Celtic Heels School of Irish Dance. It will feature Russ Thomas and the Nearly Normal String Band, Katherine First & Last Night’s Fun, Celticado, Fireseed and Hob Sew & The Greens. For the fiddler’s festival, bring your fiddle, guitar, banjo, bass, harmonica or other instruments and join informal jams. Seasoned and beginner musicians welcome. Old-time, Appalachian, Irish and more. Bring chairs or blankets.