Historical clue formulations

• Stage opening, perhaps — 2024-06-08
• Prop that enabled Houdini to "walk through" a brick wall — 2022-09-11
• Opening in the theater, maybe — 2019-11-10
• Hidden exit — 2013-08-19
• Location for a fall — 2010-08-01
• Magician's secret exit — 2005-02-02
• Secret exit, perhaps — 2004-02-10
• Cause of an unexpected fall — 1997-07-07