Historical clue formulations

• Pays (up) — 2026-03-28
• Polo participants — 2025-01-10
• Pays (up) — 2024-03-24
• Some carnival rides — 2014-10-22
• Track bettors play them — 2010-07-27
• Subjects of many bets — 2008-12-07
• They're played at the track — 2007-10-26
• Express team? — 1999-06-26
• Polo participants — 1994-05-22