The What the Fluff Festival is an annual event that honors the invention of Marshmallow Fluff and celebrates Somervilles proud tradition of innovation. The festival is held in Union Square, Somerville, and features live music, fluffalicious feasts, sticky games, zany happenings, and much more. The festival is produced in partnership with Union Square Main Streets, a 501(c)(3) nonprofit organization. The 18th Annual What the Fluff Festival is scheduled for Saturday, September 23, 2023, from 3-7 pm, with a rain date of Sunday, September 24, 2023. The festival is organized by the Fabulous Fluff Planning Team, who have come together to plan a flufftastic event. Scores of local businesses will be opening their doors to Fluff lovers in the lead up and during the Festival for you to enjoy scrumptiously sticky treats, buy limited edition Fluff goodies, and take advantage of other flufftastic specials. The festival is a great opportunity to discover tasty local treasures, raise a pint of Fluff with friends old and new, dance in the streets, and make sweet memories at the most flufftastic end-of-summer celebration in New England.