Historical clue formulations

• Group holding a nominating convention — 2026-09-15
• Shindig — 2026-01-20
• Subject of an R.S.V.P. — 2026-01-11
• See 61-Across — 2025-12-31
• Blowout — 2024-09-13
• Event suggested by this puzzle's circled squares, read clockwise from the top — 2023-12-30
• Person in a contract — 2021-05-14
• Have a good time — 2018-05-04
• Republicans or Democrats — 2017-07-03
• Part of G.O.P. — 2016-05-17
• GO* — 2015-02-03
• The "P" of G.O.P. — 2014-09-01
• New Year's Eve staple — 2014-03-11
• Kegger, e.g. — 2009-01-21
• Kegger, e.g. — 2008-05-27
• With 62-Across, clue for 19-, 37- and 50-Across — 2007-05-03
• Shindig — 2004-07-12
• Have a ball? — 2004-05-11
• Socialists, e.g. — 2003-08-19
• Neighborhood shindig — 2003-08-14
• Shindig — 2003-03-10
• Do — 2000-12-17
• The Greens, say — 2000-11-07
• It's subject to crashing — 2000-09-09
• Revel — 1999-10-24
• Telephone user — 1998-09-27
• Where to find favors — 1998-03-11
• Whoop it up — 1997-05-16
• Do — 1997-01-12
• Plaintiff or defendant — 1994-10-17
• Have a ball — 1993-12-18