Mr. Seeger and his wife of 67 years, Toshi-Aline Ôhta, spend Sundays around the Dutchess County house he built by hand, unless he grabs his banjo and ventures out to the Beacon Sloop Club. He helped build that, too, by tricking people into volunteering. “I called it a pot-luck supper, and 30 people showed up,” he said. “Food is one of the great organizing tools.”

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