Question: What date did "Night of the Dolphin" appear on The Simpsons?

Context articles: Twelfth Night (holiday)
Safe (song)
Emeraldia
The Simpsons shorts
Good Night (The Simpsons short)
Dolphin Hotel, Southampton
Treehouse of Horror XI
The Simpsons (season 12)
In the Name of the Grandfather
Heathcote Williams

Twelfth Night is a festival in some branches of Christianity marking the coming of the Epiphany.
 Different traditions mark the date of Twelfth Night on either 5 January or 6 January; the Church of England, Mother Church of the Anglican Communion, celebrates Twelfth Night on the 5th and "refers to the night before Epiphany, the day when the nativity story tells us that the wise men visited the infant Jesus".
 In Western Church traditions, the Twelfth Night concludes the Twelve Days of Christmas; although, in others, the Twelfth Night can precede the Twelfth Day.
 Bruce Forbes writes:In 567 the Council of Tours proclaimed that the entire period between Christmas and Epiphany should be considered part of the celebration, creating what became known as the twelve days of Christmas, or what the English called Christmastide.
 On the last of the twelve days, called Twelfth Night, various cultures developed a wide range of additional special festivities.
 The variation extends even to the issue of how to count the days.
 If Christmas Day is the first of the twelve days, then Twelfth Night would be on January 5, the eve of Epiphany.
 If December 26, the day after Christmas, is the first day, then Twelfth Night falls on January 6, the evening of Epiphany itself.
"Safe" is a song by Irish pop group Westlife from their tenth and final studio album "Gravity" (2010) and this pop rock ballad was released on 14 November 2010 as the album's lead and only single in the United Kingdom.
 It was written by John Shanks and James Grundler, and the single version was produced by Shanks, Richard "Biff" Stannard, and Ash Howes.
 "Safe" debuted at number four in Ireland, becoming their twenty-fifth top ten single.
 It charted at number ten in the UK, becoming their second-lowest-charting single to date.
 The song was featured in the 2010 movie Dolphin Tale starring Morgan Freeman.
Emeraldia (エメラルディア , Emerarudia ) is a puzzle arcade game released by Namco in 1993 only in Japan; it runs on the company's NA-1 hardware, and was the eighth game from them to allow scores not ending in "0" as well as the third of this type that did not use a Yamaha YM2151 for its music.
 On March 26, 2009, it was rereleased on the Wii's Virtual Console - and the Stars (from "") also appear during the game's Normal mode, but this time they will eliminate every block of the colour that they land on.
 The Ojama Blocks in Versus mode also have the face of "Gerochan", the frog from "Super World Court"; they will appear upon the other player's side of the screen when one player eliminates a lot of blocks at once (their dolphin will blow up a beach ball and bounce it over to the other side during this time) and cannot be eliminated.
The Simpsons shorts are an American animated TV series of 48 one-minute shorts that ran on the variety television program "The Tracey Ullman Show" for three seasons, before the characters spun off into "The Simpsons", their own half-hour prime-time show.
 It features Homer, Marge, Bart, Lisa, and Maggie.
 The series was created by Matt Groening, who designed the Simpson family and wrote many of the shorts.
 The shorts first aired on April 19, 1987 starting with "Good Night".
 The final short to air was "TV Simpsons", originally airing on May 14, 1989.
 "The Simpsons" later debuted on December 17, 1989, as an independent series with the Christmas special "Simpsons Roasting on an Open Fire".
"Good Night" (also known as "Good Night Simpsons") is the first of forty-eight Simpsons shorts that appeared on the variety show "The Tracey Ullman Show".
 It originally aired on the Fox network in the United States on April 19, 1987, during the third episode of "The Tracey Ullman Show" and marks the first appearance of the Simpson family — Homer, Marge, Bart, Lisa, and Maggie — on television.
 After three seasons on Tracey Ullman, the shorts would be adapted into the animated show "The Simpsons".
 "Good Night" has since been aired on the show in the episode "The Simpsons 138th Episode Spectacular" (in its entirety), along with several other Ullman shorts, and is one of the few shorts to ever be released on DVD, being included in the Season 1 DVD set.
The Dolphin Hotel is a Grade II* listed 4-star hotel, which is the oldest in Southampton, Hampshire.
 Recorded mentions of the hotel date back to 1454 although it is believed to older than this and remnants of the original medieval timbers, and stone vaulting are extant.
 The hotel reopened on 4 May 2010 following a £4 million redevelopment programme.
"Treehouse of Horror XI" is the first episode of "The Simpsons"<nowiki>'</nowiki> twelfth season and the 249th overall, and the eleventh Halloween episode.
 The episode features "G-G-Ghost D-D-Dad", "Scary Tales Can Come True" and "Night of the Dolphin" and was written by Rob LaZebnik (story by Mike Scully), John Frink and Don Payne and Carolyn Omine and directed by Matthew Nastuk.
"The Simpsons"' twelfth season originally aired between November 2000 and May 2001.
 It began on Wednesday, November 1, 2000 with "Treehouse of Horror XI".
 The season contains four hold-over episodes from the season 11 (BABF) production line.
 The showrunner for the twelfth production season was Mike Scully.
 The season won and was nominated for numerous awards including two Primetime Emmy Awards wins and an Annie Award.
"In the Name of the Grandfather" is the fourteenth episode of the twentieth season of "The Simpsons".
 It first aired on Sky1 on St. Patrick's Day, March 17, 2009 and aired on the Fox network in the United States on March 22, 2009.
 It was the first episode of the show to premiere in Europe before airing on Fox.
 In the episode, the Simpsons buy a new hot tub and spend so much time relaxing in it that they neglect Abraham "Grampa" Simpson.
 Homer decides to make it up to Grampa by helping him do one thing he wants to do.
 Grampa reminisces about O'Flanagan's pub in Ireland where he once had the best night of his life so the Simpsons travel there.
 Marge, Bart and Lisa visit various Irish landmarks while Homer and Grampa buy O'Flanagan's during a night of binge drinking and soon discover that pubs are no longer popular in Ireland.
John Henley Heathcote-Williams (15 November 1941 – 1 July 2017), known as Heathcote Williams, was an English poet, actor, political activist and dramatist.
 He wrote a number of book-length polemical poems including "Autogeddon", "Falling for a Dolphin" and "Whale Nation", which in 1988 became, according to Philip Hoare, "the most powerful argument for the newly instigated worldwide ban on whaling."
 Williams invented his idiosyncratic "documentary/investigative poetry" style which he put to good purpose bringing a diverse range of environmental and political matters to public attention.
 His last published work, "American Porn" was a critique of the American political establishment and the election of President Donald Trump: Publication date was the date of Trump's inauguration (20 January 2017).
 In June 2015, he published a book-length investigative poem about the "Muslim Gandhi", Khan Abdul Ghaffar Khan, "Badshah Khan".