The parade, set to begin at 2 p.m. at the steps of Town Hall, will move up to and along the Post Road to Greenwich Avenue before stopping for a flag ceremony at Havemeyer Field.
Among those expected to march are descendants of the town's founding families, representatives of several town organizations and a number of nonprofit agencies and community groups.
The parade also will feature floats, antique cars, vintage and modern fire trucks and the Wells Fargo carriage and horses.
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