Raw States

What the Fluff? Festival

Somerville, MA · Quirky

When

September 19, 2026

Where

Union Square · Somerville · MA

Cost

Not confirmed

Status

Confirmed from the organizer's published schedule

A street festival in Union Square celebrating Marshmallow Fluff, invented in Somerville in 1917. Run by the Somerville Arts Council and Union Square Main Streets, the 2026 edition marks its 21st year with Fluff-themed food, cooking contests and live music.

The history within reach

• Somerville's main post office, built by the PWA0.1 mi

  The Public Works Administration paid for this Washington Street post office, put up in 1935 and 1936 with the Depression still on.

• Union Square is named for the army that mustered there0.1 mi

  The square took its name during the Civil War, when it served as a recruiting and mustering ground for the Union Army.

• The Grand Union flag goes up on Prospect Hill0.1 mi

  On New Year's Day 1776 the first flag of the united colonies was raised over the fortified hill above Union Square, six months before independence was declared.

• Union Square gets its train back after 84 years0.2 mi

  The Fitchburg Railroad put a stop at Prospect Street in the 1840s and renamed it Union Square around 1875, then closed and demolished it in 1938.

• Camp Prospect Hill trains volunteers on a Revolutionary fort0.3 mi

  The Union Army ran a training camp on Prospect Hill in 1861, on the same high ground the Continental Army had fortified in 1775.