Historical clue formulations

• Summer office workers — 2023-12-18
• Some residents — 2009-02-22
• Future residents — 2007-09-30
• They're often unpaid — 2007-08-18
• Washington posts — 2006-12-02
• Some summer workers — 2004-05-09
• "ER" sights — 1995-06-11
• Hospital personnel — 1994-02-09