Historical clue formulations

• Soon-to-be graduates — 2026-04-21
• Some prank pullers — 2024-05-01
• They have an "itis" named after them — 2020-06-20
• Upper class — 2017-02-24
• High class — 2014-07-25
• 12th graders — 2009-11-09
• Promgoers — 2007-02-22
• Graduates-to-be — 2006-07-03
• Admission discount recipients, often — 2004-09-24
• Tour for Nicklaus — 2003-02-26
• Golden-agers — 2002-04-11
• Kind of tour — 1997-02-09
• Like some golfers — 1996-11-09