Historical clue formulations

• Uses caution while in public during flu season, say — 2026-08-13
• Catchers' wear — 2026-03-19
• Some spa treatments — 2026-02-12
• Halloween disguises — 2023-10-16
• Guy Fawkes Night accessories — 2023-01-07
• Covers up — 2012-12-23
• Halloween purchases — 2009-08-10
• Snorkelers' wear — 2004-09-17
• Halloween disguises — 1998-09-08
• Mardi Gras sights — 1994-02-09