Historical clue formulations

• Some hotel and restaurant staffers — 2022-01-10
• Employees who work a lot — 2021-11-07
• Drivers who rarely have passengers — 2021-01-26
• Team at an upscale restaurant — 2019-08-11
• "Key" hotel personnel — 2018-01-02
• Has parked — 2012-02-26
• Employees at a ritzy hotel — 2012-02-17
• Gentlemen's gentlemen — 2005-10-10
• Parking meeters? — 2001-01-21