As for the Topic of the Day...
My first Broadway show on tour was either The King & I or Fiddler On the Roof with one of "THE" Tevye's. -I forget which one. But I do remember that it was at the National Theatre in DC. -And I also remember how seeing that house open-up like a story book was so magical.
My first Broadway show on Broadway was Brighton Beach Memoirs - the first replacement cast. John Cryer was playing Eugene. -And then my second Broadway show on Broadway, which I saw the next afternoon (a Wednesday), was Biloxi Blues with the original cast. It was in the second week of previews.
Alas, the first Broadway musical I saw on Broadway - which was the evening following Biloxi Blues - was The Tap Dance Kid. Most of the original cast was still in it. Alas, Alfonso Ribiero was out that night, and I believe the "kid" we saw was only on for the second or third time.