The 19th annual "What the Fluff Fest" location in Union Square in Somerville celebrating a Massachusetts Treasure: Marshmallow Fluff!About the Festival:A Tribute to Union Square Innovation is a madcap festival honoring the invention of Marshmallow Fluff, returning for its 19th year. It celebrates Somerville’s proud tradition of innovation with live music, fluffalicious feasts, sticky games, […]