Nothing appears to me to give the children so much becoming confidence and behavior, and so to raise them to the conversation of those above their age, as dancing. I think they should be taught to dance as soon as they are capable of learning it, for, though it consist only of outward gracefullness of motion, yet I know not how, it gives children manly thoughts and carriage more than any thing.
--John Locke
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.