Wikipedia talk:Selected anniversaries/December 18

2011 notes
--  howcheng  {chat} 06:17, 18 December 2011 (UTC)
 * Swapped out and moved to Ineligible: Battle of Verdun
 * New observances: Republic Day (Niger) (used to go to Republic Day), Qatar National Day
 * Swapped out: SCORE (satellite), Epimetheus (moon), Copenhagen Accord
 * Swapped in: The Nutcracker (4th appearance, last in 2009), Operation Linebacker II (2nd appearance, last in 2009), Perl (first appearance, but blurb used to feature Larry Wall, which is now ineligible), 2006–2007 Malaysian floods (first appearance)
 * Left in: Piltdown Man (3rd consecutive appearance, 3 total)—would have taken it out, but the remaining eligible items are all 1950 and later; kept it in for a better chronological balance.

2012 notes
— howcheng  {chat} 17:25, 17 December 2012 (UTC)
 * New articles (unused): Tunisian revolution
 * Omitted: Operation Linebacker II (ineligible—maintenance); Perl; 2006–2007 Malaysian floods
 * Included: Battle of the Heligoland Bight (1939) (first appearance); Epimetheus (moon) (7th appearance, last in 2010); Oakland Ebonics controversy (first appearance)
 * Repeats: The Nutcracker (2nd consecutive appearance, 5 total); Piltdown Man (4th consecutive appearance, 4 total; 100th anniversary)

2013 notes
— howcheng  {chat} 07:44, 17 December 2013 (UTC)
 * Omitted: Qatar National Day (ineligible—maintenance); Piltdown Man; Battle of the Heligoland Bight (1939); Oakland Ebonics controversy
 * Included: Battle of Verdun (4th appearance, last in 2010; rescued from Ineligible); SCORE (satellite) (2nd appearance, last in 2010); Tunisian Revolution (first appearance)
 * Repeats: The Nutcracker (3rd consecutive appearance, 6 total); Epimetheus (moon) (2nd consecutive appearance, 8 total)

2014 notes
— howcheng  {chat} 11:20, 17 December 2014 (UTC)
 * Moved to Ineligible: Piltdown Man (maintenance)
 * New articles (unused): Chadian Civil War (2005–10)
 * Omitted: Battle of Verdun; SCORE (satellite) (ineligible—maintenance); Epimetheus (moon); Tunisian Revolution
 * Included: Angola Horror (first appearance); Battle of the Heligoland Bight (1939) (2nd appearance, last in 2012; 75th anniversary); Oakland Ebonics controversy (2nd appearance, last in 2012); Copenhagen Accord (2nd appearance, last in 2010)
 * Repeats: The Nutcracker (4th consecutive appearance, 7 total)

2015 notes
— howcheng  {chat} 08:22, 16 December 2015 (UTC)
 * Omitted: Battle of the Heligoland Bight (1939); Oakland Ebonics resolution; Copenhagen Accord
 * Included: Battle of Verdun (5th appearance, last in 2013); Perl (2nd appearance, last in 2011); Chadian Civil War (2005–10) (first appearance; 10th anniversary)
 * Repeats: Angola Horror (2nd consecutive appearance, 2 total); The Nutcracker (5th consecutive appearance, 10 total)

2016 notes
— howcheng  {chat} 09:02, 17 December 2016 (UTC)
 * New articles (ineligible): Mohammad Mofatteh
 * Omitted: The Nutcracker (ineligible—maintenance); Perl; Chadian Civil War (2005–10)
 * Included: Battle of the Heligoland Bight (1939) (3rd appearance, last in 2014); Epimetheus (moon) (9th appearance, last in 2013; 50th anniversary); Oakland Ebonics resolution (3rd appearance, last in 2014; 20th anniversary)
 * Repeats: Angola Horror (3rd consecutive appearance, 3 total); Battle of Verdun (2nd consecutive appearance, 6 total; 100th anniversary)

2017 notes
— howcheng  {chat} 19:10, 18 December 2017 (UTC)
 * Deleted: Battle of the Trebia (exact date is unknown)
 * Moved to Ineligible: Perl (maintenance)
 * Omitted: Angola Horror (ineligible—maintenance); Battle of Verdun; Oakland Ebonics resolution
 * Included: Rebellion of the Alpujarras (1499–1501) (first appearance); Land speed record (first appearance); 1963 Moscow protest (first appearance); James Watney (first appearance); Ty Cobb (first appearance); Alexei Kosygin (first appearance)
 * Repeats: Battle of the Heligoland Bight (1939) (2nd consecutive appearance, 4 total); Epimetheus (moon) (2nd consecutive appearance, 10 total)

2018 notes
— howcheng  {chat} 16:56, 18 December 2018 (UTC)
 * Rescued from Ineligible (unused): Angola Horror; 1932 NFL Playoff Game; Perl
 * New articles (unused): 2017 Washington train derailment
 * Omitted: Battle of the Heligoland Bight (1939); 1963 Moscow protest; Epimetheus (moon); James Watney; Ty Cobb; Alexei Kosygin
 * Included: Battle of Verdun (7th appearance, last in 2016); SCORE (satellite) (3rd appearance, last in 2013; rescued from Ineligible; 60th anniversary); Tunisian Revolution (2nd appearance, last in 2013); Yaonian Yanmujin (first appearance); Lionel Monckton (first appearance); Edwin Howard Armstrong (first appearance)
 * Repeats: Rebellion of the Alpujarras (1499–1501) (2nd consecutive appearance, 2 total); Land speed record (2nd consecutive appearance, 2 total)

2019 notes
— howcheng  {chat} 16:53, 19 December 2019 (UTC)
 * Omitted: Land speed record; Battle of Verdun; SCORE (satellite); Tunisian Revolution; Yaonian Yanmujin; Lionel Monckton; Edwin Howard Armstrong
 * Included: Angola Horror (4th appearance, last in 2016); Battle of the Heligoland Bight (1939) (5th appearance, last in 2017; 80th anniversary); On Her Majesty's Secret Service (film) (first appearance; 50th anniversary); Copenhagen Accord (3rd appearance, last in 2014; 10th anniversary); Edith of Wessex (first appearance); Jean-Baptiste Lamarck (first appearance); Tara Conner (first appearance)
 * Repeats: Rebellion of the Alpujarras (1499–1501) (3rd consecutive appearance, 3 total)

2020 notes
— howcheng  {chat} 20:10, 19 December 2020 (UTC)
 * Moved to Ineligible: Perl (maintenance); Chadian Civil War (2005–2010) (maintenance)
 * Omitted: Rebellion of the Alpujarras (1499–1501); Angola Horror; Battle of the Heligoland Bight (1939); On Her Majesty's Secret Service (film); Copenhagen Accord; Edith of Wessex; Tara Conner
 * Included: Battle of Mbumbi (first appearance); Land speed record (3rd appearance, last in 2018); 1932 NFL Playoff Game (first appearance); 2017 Washington train derailment (first appearance); Charles Wesley (first appearance); Keith Richards (first appearance)
 * Repeats: Jean-Baptiste Lamarck (2nd consecutive appearance, 2 total)

2021 notes
— howcheng  {chat} 05:27, 19 December 2021 (UTC)
 * Omitted: Battle of Mbumbi; 1932 NFL Playoff Game; 2017 Washington train derailment; Charles Wesley; Jean-Baptiste Lamarck; Keith Richards
 * Included: Rebellion of the Alpujarras (1499–1501) (4th appearance, last in 2019); Battle of Verdun (8th appearance, last in 2018); African-American Vernacular English and education (4th appearance, last in 2016; 25th anniversary); Henrietta Edwards (first appearance); Robert Moses (first appearance); Noriko Matsueda (first appearance; 50th birthday)
 * Repeats: Land speed record (2nd consecutive appearance, 4 total)