Historical clue formulations

• Election Day is one: Abbr. — 2025-09-07
• Voting day: Abbr. — 2024-10-20
• It's named for the Norse god of war: Abbr. — 2020-05-23
• Election day in the U.S.: Abbr. — 2019-02-20
• A school yr. often begins on one — 2018-11-08
• It's named for a Scand. god of battle — 2014-10-04
• Election day: Abbr. — 2012-12-10
• Calendar heading: Abbr. — 2012-08-09
• When many ballots are cast: Abbr. — 2011-11-25
• Part of Shrovetide: Abbr. — 2009-12-04
• Election day: Abbr. — 2006-09-24
• Mardi Gras, e.g.: Abbr. — 2006-09-19
• Calendar abbr. — 2006-04-27
• January 27, 1756 (Mystery Person's birthdate), e.g. — 2006-01-22
• When to vote, often: Abbr. — 2004-02-27
• Calendar column: Abbr. — 2001-05-06
• Calendar abbr. — 1997-08-09
• Calendar abbr. — 1996-06-16
• Calendar col. — 1995-05-14
• Calendar abbr. — 1995-02-14
• Amer. election day — 1995-01-12