Historical clue formulations

• Prom, e.g. — 2026-02-11
• Like a black-tie wedding — 2024-11-25
• Calling for tails, maybe — 2023-06-01
• White-tie event — 2015-01-27
• Not casual — 2011-08-09
• Starchy — 2005-10-14
• Like a prom — 2005-04-21
• Dance — 1997-11-01