For this special edition of Mystery History, guesses on this blog are disqualified because this contest is strictly low-tech.
At the end of the exhibition there is a wall with three photos and corresponding color-coded sheets you can fill out with your best guesses for the three photos, then place them in the suggestion box.
I'll take the people who win for each photo out to lunch, my treat!
I'll reveal the back story to the photo above on my blog Thursday, March 5.
I'll post the third photo March 17 and that big reveal on March 19.
Photo #1 was revealed on Feb. 19. You can see that post here.