[Callers] Some contra dance history of interest:

In 1810, and for some years before and after, Sudbury MA (incorporated in 1639) was the site of a monthly barn dance. One of the local dance masters, Allen Ortep, composed a contra dance, where four dancers would balance in a circle, left foot then right foot, followed by shift/spin left one place. Allen and another local dance master both had interest in the same lady. To shorten a long story, Allen did not get the lady, and eventually stopped attending the Sudbury dances. His successful rival then composed a dance where four dancers balanced in a circle, right foot then left foot, followed by a shift/spin right one place, and named it petronella (spell petronella backwards to find out why). To honor these events, Sudbury MA was given the zipcode 01776. (Thanks to Don Veino for pointing out Sudbury's zipcode.)