Historical clue formulations

• Bat Appreciation Month, fittingly — 2023-06-13
• What "10" can mean — 2022-03-06
• What the Old English called "Winterfylleth" — 2020-10-04
• Month with Columbus Day — 2016-02-01
• Kind of surprise — 2012-05-06
• When Canada celebrates Thanksgiving — 2010-12-26
• When the swallows leave Capistrano — 1995-12-01