Historical clue formulations

• Act starter — 2017-04-25
• Theater opening — 2014-05-25
• It follows a curtain opening — 2013-05-31
• It takes place on board a ship at sea in "The Tempest" — 2010-12-24
• Start of an act — 2010-02-08
• Act starter — 2007-06-19
• Shakespearean opener — 2007-06-16
• Curtain raiser? — 2006-08-27
• Dramatic opening — 2005-10-14
• Theater opening — 2005-05-01
• Act opener — 2003-06-04
• Opening on stage — 2002-07-06
• Act starter — 2000-06-24
• Opener, of sorts — 1996-12-13
• Play's start — 1994-06-20