The cafe asked about several qq ago was almost certainly the Second Fret, 1902 Sansom St. (I can almost hear Gene Shay's voice saying that) and not the Cage. I never saw Hedy W there, but did get to see her once at a folk festival in central NJ in summer 1971; in addition to all her traditional Appalachian material she did some Kurt Weill/Berthhold Brecht songs (not just from Threepenny Opera) and this wonderful parody of 'my favorite things' that I can still remember a few lines from after all these years.