Whew! It came out better than I expected. You must have done a lot of work adjusting the contrast and saturation, Great Rao -- good job!
They weren't Kryptonian, nor did they wear capes, but William Aronis and Maureen Reynolds were definitely official "Superchildren" -- they even had the trophies to prove it! One wonders if DC ever sponsored another "Superboy" and "Supergirl" contest, or if they were the only ones.
By the way, I also did some historical research. Notice the newspaper article mentioned the Rumanian Pavilion flags at half-staff? On June 28, the Soviet Union had seized the Rumanian province of Bessarabia. (The Soviet Union had one of the larger pavilions when the World's Fair opened in 1939, but after invading Finland, Moscow announced that the USSR would not participate in the 1940 season. They were not missed, and the Pavilion was razed for an "American Common" greenspace area.)
And on "Superman Day", British warships opened fire on their former French allies at Mers-el-Kebir, sinking two battleships and killing nearly 1,300.
More information of this incident can be found here:
http://en.wikipedia.org/wiki/Destruction_of_the_French_Fleet_at_Mers-el-KebirProbably in reaction to Mers-el-Kebir, a bomb was placed at the British Pavilion the next day, July 4. It exploded while New York police assigned to the World's Fair tried moving it to another location, killing two officers and wounding four more. Reading the newspaper account, one gets the impression that the Fair promoters were desperately trying to reassure the public by downplaying the potential for further violence. But it was increasingly more difficult to ignore the looming war clouds, even inside the utopian "World of Tomorrow".
A couple more links:
http://www.hakes.com/item.asp?ListID=8&ItemNo=40001(Better get this image of the "Superman Day" sign before it's gone...)
http://www.supermanhomepage.com/other/other.php?topic=dyk-ray-middleton(The color photo of Ray Middleton looks retouched, but it could be used as a guide for our proposed "Super-Family" cover.)
By the way,
https://www.supermanthroughtheages.com/sites/supermanday/ says:
"Superman Day at the New York World's Fair was not 1939, but July 3, 1940. This was the first day that the admission price was reduced to a dime.
The person being quoted made a slight error. Children's admission was reduced to a dime only on Wednesdays during the summer of 1940. Superman Day was the first of these special kid-oriented Wednesday special events.