Historical clue formulations

• 1991 Broadway musical nominated for 11 Tonys — 2020-01-04
• Musical with the song "Bui Doi" — 2012-09-28
• "Madame Butterfly," updated — 2007-09-01
• Broadway premiere of April 11, 1991 — 1999-05-02
• 1991 Broadway smash — 1995-09-12
• Opening of 4/11/91 — 1994-01-26