Casa Susanna was a guest house in the Catskill Mountains of Upstate New York where crossdressers dressed en femme during their visits in the 1960s.
Although not mentioned by name, My Year Among the Girls by Darrel G. Raynor published in 1968 documented one crossdresser's experience at Casa Susanna.
Casa Susanna by Michel Hurst and Robert Swope published in 2005 was a collection of snapshots found at a New York City flea market that depicted various crossdressers during their stay at the guest house.
I have mentioned both of these books here in the past. My Year Among the Girls was an eye-opener for me; reading that book when I was 17, I discovered that I was not alone.
I hope I have an opportunity to see the play, preferably en femme.
Harvey Fierstein, circa 1970.