Historical clue formulations

• Proponents of crystal healing — 2024-10-24
• Parlays, e.g. — 2022-10-22
• Reds, blacks, evens or odds, in roulette — 2018-08-15
• Bets — 2016-12-18
• They're on the books — 2010-10-08
• Exactas and trifectas — 2008-04-29
• Is a gamester — 2001-05-10
• Parlays, e.g. — 1994-02-05