The Prosser States Day celebration, now in its 89th year, is from 10 a.m. to 10 p.m. Sept. 1.
Most events will happen at City Park in the heart of downtown Prosser at the corner of Sommers and Seventh streets.
The parade starts at 10 a.m. at Keene-Riverview Elementary School, 832 Park Ave., heads down Bennett Street, takes a right on Seventh Street, right on Prosser Avenue, right on Sixth Street then left on Meade Avenue. The parade ends back at the elementary school.
There will be concessions and entertainment happening throughout the day, including a stage show with a variety of acts performing.
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Food vendors and arts and crafts booths open at noon, along with carnival rides. A wristband is $20 for all rides all day.
States Day has been celebrated in Prosser since 1925 as a way to bring the community together after harvest for a picnic. Since then, the event has grown to include a parade and other events, said Humberto Rodriguez, executive director of the Prosser Chamber of Commerce, who sponsors the event.
"It started out as an event where old friends got together on Labor Day weekend to have some fun at the end of summer," Rodriguez said.
"Games were played, a dance was held, and over the years, new events were added to the day. A rival baseball game between neighboring towns was the highlight for many years," he said.
Admission to the park is free.