What the Fluff? A Tribute to Union Square Innovation is a lively festival celebrating the invention of Marshmallow Fluff and Somerville’s legacy of creativity. This year will feature live music, fluff-filled feasts, fun games, and zany activities.

This year’s theme, Forever Fluff: 20 Years of Sticky, Sweet Somerville, commemorates the endurance of this endlessly unique and unexpected celebration.

If anything’s proved true over these 20 years, it’s that folks don’t Fluff around for just one day. Fluff tattoos? Been there. Fluff “I dos”? Done that. In Somerville, Fluff is so much more than just a culinary confection; it’s a time-honored tradition you can really sink your sweet tooth into.

Devour deliciously diverse food, shake it alongside toe-tapping performances, feud in family-friendly games, and visit with a variety of vendors who know what Fluff is all about. Whether this will be your 1st, 5th, or 20th Fluff Fest, Forever Fluff is sure to have something for Fluff fans of all ages. Life is eternally changing. Fluff is Forever.

What the Fluff? is organized by Union Square Main Streets, a nonprofit dedicated to preserving the character and strength of the Union Square business district, in partnership with the Somerville Arts Council’s ArtsUnion initiative to boost cultural economic development.