Historical clue formulations

• Start to fall? — 2025-02-04
• Semiannual event — 2011-03-18
• Fall time — 2003-04-26
• March 21 occurrence — 2001-02-05
• Occasion at Stonehenge — 2000-10-27
• Spring time — 2000-03-24
• March 21 occurrence — 2000-02-21
• September occurrence — 1996-07-06
• September event — 1994-08-19