Oct18
Festival
Somerville Monster Mash
WhenSunday, October 18, 2026
All day
All day
WhereSomerville Avenue between Church Street and Union Square · Somerville
The annual Monster Mash celebration returns to Somerville on Sunday, Oct. 18, from 1 p.m. to 5 p.m., on Somerville Avenue between Church Street and Union Square. The free event features a costume parade, live music, pumpkin carving, and more activities for all ages.
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