Rainbow Quest does talk about the Chicago scene, but not in any great detail. Cohen talks briefly about the Gate of Horn, WFMT, the U of Chicago Folk Festivals, and the Old Town School, but that's about as far as he goes.

I have not been able to find much in print about many of the folk music communities that have existed in major cities and college towns across the country since at least the 1950s (maybe earlier). All of the books about the revival that I have seen have concentrated on either the relationship between folk music and the movements for social change (civil rights, anti-war, women's movement annd so forth), or on the careers of the professional and semi-professional musicians who were more visible outside the community. Nobody pays much attention to the importance of the parties, camps and "insider" festivals like Fox Hollow and Sweets Mill (among many others) that have been the backbone of the revival.

There's certainly a potential book about the folk revival in Chicago (or the Midwest in general, including Detroit, Minneapolis, St. Louis and the various college campuses, and how they all interacted). Who wants to write it?