This image represents a specific date:
Disregard the poor quality of the image, consider all the little squares to be the same. :)
What specific date am I looking for? (Year, Month, Date)
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July 12, 1979
Because that date was
Disco Demolition Night, a promotion by Bill Veeck (as in Wreck), intended as a double header, but the second game was canceled due to the fracas and damage done during the first game.
The picture above shows an un-filled-out baseball scorecard, indicating (possibly) a game that was never played.
May 12, 1917
both pitchers had a no-hitter through 9 innings? http://www.baseball-reference.com/boxes/CHN/CHN191705020.shtml
March 31, 1998
The date of first Arizona Diamondbacks home game
The logo in the back of the image is the second Diamondbacks logo (which might be the date you're looking for too) and the squares are lined up like the pattern on a diamondback snake.
Really I can throw darts at a bunch of D-Backs dates, but I don't have any clue as to which one you're looking for :)