I identified this photo postcard as a dance marathon on the basis of the sign in the upper left corner "THEY HAVE BEEN GOING 479 HOURS." That's nearly 20 days!
HistoryLink.org has an excellent article Dance Marathons of the 1920s and 1930s.
Dance Marathons (also called Walkathons), an American phenomenon of the 1920s and 1930s, were human endurance contests in which couples danced almost non-stop for hundreds of hours (as long as a month or two), competing for prize money. Dance marathons originated as part of an early-1920s, giddy, jazz-age fad for human endurance competitions such as flagpole sitting and six-day bicycle races. Dance marathons persisted throughout the 1930s as partially staged performance events, mirroring the marathon of desperation Americans endured during the Great Depression. In these dance endurance contests, a mix of local hopefuls and seasoned professional marathoners danced, walked, shuffled, sprinted, and sometimes cracked under the pressure and exhaustion of round-the-clock motion.The blog Blondie Cuts a Rug has another informative article with the same title, and many photos from dance marathons.
I don't know when or where the dance marathon on my postcard occurred. The names Rustic Inn, Eddie, and Cloris could be clues. A couple of Eddies are listed on the Dance Marathons page of Dance history Archives, but Eddie is a common name. Rustic Inn is also a fairly common name that is still in use at a variety of places. I found the postcard in Minnesota, so Minnesota is a possibility. I checked a page about Minnesota marathon dances. There are some interesting photos there, but nothing like this.
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