Real photo postcard of a scene most likely at Eastport, Maine. Someone wrote on the reverse "Getting Ready for Sideshow".
The card was addressed by Uncle Fred to Miss Laura B. Hutchinson at Bethel, Maine but was not sent through the mails.
From online research, hopefully correct - corrections and additions requested:
Laura Beatrice Hutchinson was born 8 June 1901 at Mason, Maine, the daughter of Ervin L. and Charlotte Augusta "Lottie" (Mills) Hutchinson. Mason, near Bethel, Maine, was dissolved in 1935 and is now called Mason Township.
On 26 May 1939, Laura married Harland J. Shaw of Paris, Maine. He was born about 1905, the son of Mark and Lois H. (Knight) Shaw. Harland died in 1969, and Laura 1987. They're buried in the Riverside Cemetery at Bethel, Maine.
I've been unable to find the identity of Uncle Fred. I've checked for siblings of parents and grandparents but am not sure I've found all of them. And there's a possibility that "Uncle" was an honorific.
If you have any corrections, additions or insights to the information presented here, please leave a comment or contact me directly.