Historical clue formulations

• Start of a child's letter — 2026-02-27
• Start of a seasonal request — 2021-03-07
• Start of a seasonal request — 2020-12-06
• Start of an anti-coal petition — 2019-08-10
• Start of a seasonal letter — 2016-05-11
• Wish list opener — 2015-11-04
• Line that goes to the North Pole? — 2011-04-13
• Start of a Christmas letter — 2009-12-28
• Letter greeting never read by its intended recipient — 2009-10-09
• Words followed by a wish list — 2009-07-11
• Opening in the North Pole? — 2007-02-25
• Seasonal salutation — 2006-05-21
• Start of a request — 2003-09-05
• Wish list opener — 2002-03-02