What the Fluff? Festival 2026
What the Fluff? returns to Union Square on September 19, 2026, from 1 to 5 p.m.; the detailed 2026 program is still forthcoming.
What the source says
What the Fluff? is presented as a tribute to Union Square innovation and the local invention of Marshmallow Fluff. The official festival homepage lists Saturday, September 19, 2026, from 1 to 5 p.m. It describes the festival format through live music, Fluff-themed food, games, and public happenings, while noting that more information about the 2026 edition is still to come. Use the official site for the eventual program, map, weather plan, street impacts, and travel updates rather than relying on material from a prior edition.
Useful details
What to know before you go.
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The official homepage lists Saturday, September 19, 2026, from 1 to 5 p.m. in Union Square.
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The organizer says the detailed 2026 program is still forthcoming.
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The festival honors the local invention of Marshmallow Fluff and Somerville's tradition of innovation.
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Union Square Main Streets presents the festival with the Somerville Arts Council.