SquareZ
One great advantage of the dance is the aid it gives in correcting defects of deportment. It is a most effective cure for shyness and self-distrust in public. It is a valuable antidote to awkwardness and hesitancy. It develops self-possession and an easy, competent carriage. And it accomplishes these benefits without expense to natural modesty, for modesty of deportment is one of the prime requirements of the ball room.
--Henry Ford
Calling Ideas for May 19, 2012

This is:

Frog Jumping Jubilee Day
In 1928, the first jumping frog contest was held in Calaveras County, California. See my original comments here.

You can break out your frog songs: "Joy to the World" ("Jeremiah was a bullfrog") and "Froggy Went a Courtin'". You could even change the words to "froggy went a jumpin'". Dancers probably wouldn't appreciate frog legs as a snack, however.