I'm surprised I never noticed this thread before, given that the CMT are the reason I became a folkie in the first place. I bought my first copy of the Mitchell Trio songbook back when I was in sixth or seventh grade, and now have both the read and black soft covers and the red one in cloth-bound, courtesy of Ebay (and I use them; my original copy is now retired because the pages are falling out). A couple of comments on earlier posts herein: the Chad Mitchell Trio became known as the Mitchell Trio in 1964, ostensibly because Joe and Mike were tired of Chad getting all the attention, but truly because Chad was planning to leave the group for a solo career, which he of couse did in the summer of 1965. Whoever it was who said Chad was sick when he saw the Trio play the Cellar Door in the summer of 1966 wasn't gonna see Chad in any event; Chad was then touring as a single and John Denver had been in the group for months. Chad was indeed arrested for possession of "contraband," but not in Chicago; it was a border incident. And, the words to Alma Mater are definitely "where we can seek the truth."
Joe is still an Episcopal priest in Torrance, CA; Mike has retired from directing all of the entertainment facilities in the city of Spokane, WA for many years, and Chad was selling real estate in Spokane but I don't think he's doing that any more. The Trio just did a celebrity cruise this past February which, unfortunately, I wasn't able to attend. I last saw them in August, 1995 at the Jersey shore with Paxton, Christine Lavin, and Yarrow/Stookey, where I was thrilled to be able to get a picture of my then-12-year-old son with each member of the Trio. They still sound damn good, even after all these years.