The Friday Night Dancers present Contra dancing, as well as some square dances and waltzes. Contra dance. The Family Dance program is a wonderful addition to the other family-oriented programs at Glen Echo Park. Blues dances. We rotate DJs and instructors each week to inspire and challenge you. Prada Serial Number Location here. The Square Rotation Program (SQROT) is a computer program that can be used at a Square Dance to assign couples to specific squares so that each couple dances with as many other couples as possible during a dance, and each couple gets an equitable number of sitouts. SQROT can also generate computer cards to.