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Events for September 7, 2026

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99th States Day Celebration parade participant waving

99th Annual States Day Celebration

Prosser City Park 1328 Sommers Avenue, Prosser

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 something for the whole family. Kicking off the day is the Grand Parade which starts at 10:00am. With a long line of marching bands, floats,…

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