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The event, which draws more than 8,000 visitors, takes place at Roger Sherman Baldwin Park, 100 Arch St., and features a day full of fun events for kids, family-friendly music and lots of great food.
It's meant to bring together the town's residents to help usher in summer and to get to know each other.
A huge draw this year is a concert performance by Eric Clapton.
Police said that I-95, Exit 3 off-ramps will be closed from 9 to 11 p.m. Arch Street and Steamboat Road will also have intermittent closures during the event.
Traffic congestion is expected throughout the entire day.
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