Historical clue formulations

• Indy 500 competitors — 2026-06-15
• 500 people? — 2025-05-31
• People in go-karts — 2020-02-19
• Meet people — 2015-04-18
• 500 people? — 2014-01-09
• Grand Prix participants — 2009-02-11
• Derby entries — 2005-06-15
• Meet people — 2005-02-25
• Go-carts — 2004-07-13
• 500 cars — 2001-07-08
• Go-carts — 1998-04-05
• Slot cars, e.g. — 1995-12-26