This building on the northwest corner of Davis Ave. and Washington St. is the most likely location of the "dancing school". It was built by Seth T. Thayer circa 1845 with the lower part occupied by a store and the upper story used as a hall for dancing classes, singing schools, a club room, and for political gatherings. Circa 1865, James M. Seamans moved his grocery store, that had been in the lower Village, to this location and maintained the fucntions of the second floor.
Grocery Store With Second-floor Dancing School Courtesy, The Digital Commonwealth
Mary Percival Winsor
This is most likely Mary Percival Winsor (1836 - 1881), the younger sister of Helen Winsor (Page 9) and the second child of the many children of Alfred Winsor and Ann Maria Bird. The family lived at 247 Walnut St. in a house that still stands. Never married, she died of ptthitis (tuberculosis) at the age of 44.
Emily Elizabeth Ripley
Emily Ripley courtesy, user Dorothy Bowmer ancestry.com
Emily Ripley (1833-1922) became a teacher in the high school. She married the Rev. James Reed, Swedenborgian minister of Boston.