I presume the book is "Women of Discriminating Taste: White Sororities and the Making of American Ladyhood" by Margaret L. Freeman, published in December of 2020.
The Edgewater Conference according to the book appeared to be a group devoted to resisting efforts to force Fraternities and Sororities to remove Racial/Religious/Creed limitations.
Information on the book and preview available at
https://www.google.com/books/edition...J?hl=en&gbpv=0