Except for the pumpkin obscured in the background, there’s nothing particularly Halloween-esque about this poster, designed by the Works Progress Administration in 1936.
Though it looks like the carnival is geared toward adults, this poster for the same Halloween event clearly has kids in mind. I’d love to know what the prizes were.
Both are part of the Library of Congress’ excellent WPA poster collection from the 1930s and 1940s.