Historical clue formulations

• They've got to hand it to you — 2021-10-23
• Some casino personnel — 2020-01-22
• Some casino staff — 2009-07-05
• Some card players — 2005-01-21
• Bridge operators? — 1997-01-25
• From whom buyers buy — 1995-02-14
• Merchants — 1994-05-08