Just saw the cover to Superboy #4 (original series).
A great image that reminded me of all this Superman day stuff.
Superboy carrying a boy and girl with question mark faces --maybe a contest inside that issue?) from 1949 I think.

"Superboy" #4 (from Sept.-Oct. 1949) featured a "Why I Like Superboy" contest for readers to write in and tell why they liked Superboy; the two winners appeared in "Superboy" #7 (from 1950). A synopsis (from:
http://darkmark6.tripod.com/superboyind1.htm):
>>Superboy No. 7
March-April 1950
Cover: Superboy vs. Humpty Dumpty //John Sikela
Story: “Around the World With Superboy” (12 pages)
Editor: Whitney Ellsworth
Writer:
Artist: Wayne Boring
Feature Character: Superboy (last appearance in ADVENTURE COMICS #150)
Intro: Doris Faris and Fred Leeds of Earth-One (only appearance for both)
GS: Mayor Higgins (last appearance in issue #5)
Comment: Doris Faris of Chicago, Illinois and Fred Leeds of Cincinnatti, Ohio were the winners of the “Why I Like Superboy” contest, and their likenesses and names are used in this story.
Synopsis: Doris Faris and Fred Leeds, the winners of the “Why I Like Superboy” contest, are brought to Smallville with an airport reception headed by Superboy. The Boy of Steel promises to grant their most heartfelt wishes. Doris says she would like to take a round-the-world trip, and Fred wants to see Superboy use all his super-powers. Superboy combines the two, using his powers on a round-the-world trip on which he takes them. He tells them that there is a puzzle connected with the places they visit, and they deduce it at the end...the first letters of Formosa, Rhodesia, Etah, Donghoi, Dera Bust, Old Faithful, Rio de Janeiro, Iran, and Smallville spell out FRED and DORIS.<<
Wonder if Doris and Fred these days still have their winning appearance issues (or recall entering).
Amusing to see the synopsis refer to 'em in the Superboy story as "the Doris Laris and Fred Leeds of Earth-One"; guess their Earth-1 counterparts would've stayed the same youthful age as Superman all these decades while their real-life counterparts aged... unless they were in the same "historical character" boat as FDR, the Beatles, and JFK... ;-)
The contest and its winners are referred to in a text page in "New Adventures of Superboy" #2 (a piece explaining the various time-eras Superboy's been depicted in over the decades, plus the then-recent move of Superboy's decade into the sixties).