SquareZ
We have dancing ... from soon after sundown until a few minutes after nine o’clock.... Occasionally the boys who play the female partners in the dances exercise their ingenuity in dressing to look as girlish as possible. In the absence of lady duds they use leaves, and the leaf-clad beauties often look very pretty and always odd enough.
--Rutherford B. Hayes
Calling Ideas for June 1, 2012

June is:

National Accordian Awareness Month
National Accordion Awareness Month was established in 1989 to promote the accordion, help spread the word about the resurgence in popularity in the accordion and to educate people about the accordion. Here's some info.

I'm sure there are bunches of (old) square dance records that feature the accordian. I tend to associate MacGregor with accordian arrangements.