Festival Date: Saturday, September 19, 2026, 1-5pm (rain or shine)
*Sunday, 9/20 is reserved in the case of severe or extreme weather.
Festival Overview: "What the Fluff? A Tribute to Union Square Invention,” a nationally recognized and locally beloved street festival, returns for its 21st year. The festival is produced by Union Square Main Streets, a 501(c)3 economic empowerment nonprofit, in partnership with the Somerville Arts Council.
This year’s theme – Legally Fluff: A Toast to Union Square – invites Fluff fans from far and wide to raise a glass of their favorite bubbly bev to celebrate Somerville’s signature sweet spread in style.
- Food vendors are strongly encouraged to present food products that use Marshmallow Fluff as an ingredient. All food products must be prepared in a licensed kitchen. Upon acceptance, food vendors will receive instructions on how to apply for the City’s temporary food permit ($50, paid to the City of Somerville). Vendors must comply with all health regulations.
- Non-Food/Craft vendors are strongly encouraged to present handmade products that relate to this year’s theme and have a Fluff component.
Product Policies:
- Vendors may not engage in promotion of religious groups, political statements, campaigning, petitioning, or signature gathering. This extends to booth setup, products, and packaging.
- Any and all items sold/presented at the Festival must be original, authentic creations conceived and executed entirely by the vendor, or the vendor must have the appropriate licenses and permissions.
- What the Fluff? celebrates and honors expression of human imagination, creation, and community. Artificial Intelligence can be used as a tool, but it should not be the primary creator of your products.
- Festival organizers reserve the right as sole purveyor at the Festival of fluffernutter sandwiches.
- The Festival hires a local artist to create an artistic representation of each year’s Festival theme for use on the official What the Fluff? merchandise and promotional items. Vendors may not utilize the annual design or official “What the Fluff?” festival logo on any product for profit.
Application timeline: We will begin reviewing applications June 23, 2026. Rolling applications accepted through August 1, 2026, or until spots are full.
Application Fee: Vendor applicants are required to pay a $15 non-refundable application fee. (You will be directed to submit your payment at the end of this application form).
- Applications submitted without payment are considered incomplete, and are not eligible for acceptance.
- The application fee is waived for Union Square Main Streets member businesses.
- Upholding USMS’ economic empowerment mission, application fee waivers for low-moderate income applicants as defined by HUD are available. If you would like to be considered for a fee waiver, please complete this attestation form.
Please note that application does not guarantee acceptance to the Festival. Vendors will be selected based on quality, creativity, product variety, appropriateness to the event, and space availability.