What The Fluff Festival 2025. 4,267 likes · 122 talking about this · 2,367 were here. A tribute to union square innovation is a madcap festival honoring the invention of marshmallow fluff, returning for its 19th year to the delight of fluff.

It celebrates somerville’s proud tradition of innovation. It celebrates somerville’s proud tradition of innovation with live music, fluffalicious feasts, sticky games, zany.