This Week:Appears to be a Cowgirl parade of some sort, film is likely Kodachrome 12ASA
Why: Loved the array of people and styles of 1950's dress to be seen, the scene of a seemingly thriving retail district as the scene of a lively Western themed event.
When: Sometime between 1955 and 1957 based upon the lettering on the mount.
Where: So far, this has been a surprising stumper. The town appears Western in theme, and the street sign clearly reads W. 9TH STREET and MAPLE ST. I have checked on Google Maps at pretty much every city of more than 50K population West of the Mississippi that might have an old commerical district on a W. 9th Street, but have come up empty. I've even checked other clues in the photo in some combination with the address, such as the Masonic Temple, the American Legion Post (79?) and Addams Tire and Supply Company. Nothing to be found yet!
UPDATE! Astute reader Ken Taylor has managed to locate where this image was taken, in a small town called Coffeyville in southern Kansas, at 900 Maple Street! Many many thanks, Ken!
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Who: Not the slightest clue.
How (much): $6.50 on an ebay Buy-it-Now listing.