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🚨 A severe weather date is reserved for
Sunday, September 21st from 2-6pm

A Tribute to
Union Square Innovation

What the Fluff? A Tribute to Union Square Innovation is a madcap festival honoring the invention of Marshmallow Fluff, returning for its 20th year to the delight of Fluff enthusiasts from Greater Boston and beyond.

It celebrates Somerville’s proud tradition of innovation with live music, fluffalicious feasts, sticky games, zany happenings, and much more.

Think you’ve got the right stuff for Fluff? Join in for all the sticky fun

More information coming soon!

Get involved in the action

Attend

RSVP on Facebook to get up to date information and the latest Fluff fun.
Facebook Event

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Volunteer

Have lots of fun, meet some new people, and maybe get a little sticky! Volunteer with the festival to get in on the behind-the-scenes action.

Sign up to Volunteer

Sponsor

Interested in sponsoring this beloved greater Boston tradition that attracts 20,000+ attendees? Contact USMS executive director Jessica Eshleman  to learn more.
jessica@unionsquaremain.org

Contact Jessica

Note: Festival attendees, as well as vendors and community groups, may not engage in promotion of religious groups, political statements, campaigning, petitioning, signature gathering, or any comparable messaging or activity.

Official Fluff Fest Merch

Strut your Somerville pride in a Fluff t-shirt, tank top, hat or sweatshirt! Limited edition 2025 Fluff merchandise (pics coming soon!) will be available at the Festival in the merch tent on Somerville Ave by Parenting Journey. Other fun fluff stuff (totes, koozies, & more!) will also be available!

Too excited to wait for the Fest?
Order your Fluff Stuff from the Fluff Vault now at the Union Square Main Streets’ online store! 

Get your fluff stuff

Show us how you fluff!

Mention us or tag us @flufffestival on your instagram posts so we can see how you Fluff.

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