magnus_hirschfeld_im_kreise.jpgYou went down a flight of stairs to a red door. You had to knock 3 times, then two more and a guy opened the little panel. You then said "Joyce sent me" and the door opened to a large room where people were dressed in all sorts of feminine clothing drinking champagne.
Honestly, you didn't meet many CDs then because you were the only one. Drag bars were common. Shops specializing in clothing were another source. But understand that prior to the 1980's "we" were breaking decency laws and were considered mentally unstable and if you met someone, they could very well be undercover cops. There were a lot less of "us" then because like today the majority never leave the house.