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  • 99th States Day Celebration parade participant waving

    99th Annual States Day Celebration

    Prosser City Park 1328 Sommers Avenue, Prosser, United States

    States Day Celebrating 99 years of Community in Prosser with New and Old Traditions Prosser's oldest community event, "States Day" will be held on Monday, September 7th 2026, and offers…

  • Crowded street at Harvest Festival with tents.

    Harvest Festival

    Downtown Prosser 701 6th Street, Prosser, United States

    The last full weekend in September is a busy one in Prosser, with the Great Prosser Balloon Rally and the Harvest Festival all in one weekend from September 25-27. After…

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