Question: Twelve-dish Christmas Eve supper is the Lithuanian dish usually held on what date?

Context articles: Kūčiukai
The Lost Christmas Eve
Badnjak (Croatian)
Twelve-dish Christmas Eve supper
Poppy milk
Sagan om Karl-Bertil Jonssons julafton
Kūčios
Bulgarian budnik
Wigilia
Christmas in Russia

Kūčiukai (also šližikai) is a traditional Lithuanian dish served on Kūčios, the traditional Christmas Eve dinner in Lithuania.
 They are small, slightly sweet pastries made from leavened dough and poppy seeds.
 There are variations in sweetness, and though usually served soaked in poppy seed milk, they are also eaten without it.
The Lost Christmas Eve is the fourth album by the Trans-Siberian Orchestra.
 It was released on October 12, 2004, and is the last album in their "Christmas trilogy", with "Christmas Eve and Other Stories" (1996) and "The Christmas Attic" (1998) coming before it.
 All three albums, as well as their "The Ghosts of Christmas Eve" DVD, were featured in the box set of "The Christmas Trilogy".
 In 2012 Trans-Siberian Orchestra toured a live production of "The Lost Christmas Eve" for the first time and performed the Rock Opera in over 100 arena shows across North America.
 In late October 2013, TSO released a narrated version of "The Lost Christmas Eve" much like they did in 2012 with "Beethoven's Last Night".
Badnjak (), refers to a log brought into the house and placed on the fire on the evening of Christmas Eve, a central tradition in Croatian Christmas celebration, much like a yule log in other European traditions (in Croatian the name for Christmas Eve is derived from the term "badnjak") as well as the Croatian name for Christmas Eve.
 The log is cut with great ceremony on Christmas Eve morning, which for Roman Catholic Croats, is December 24.
 The cutting, preparation, bringing in, and laying on the fire, are surrounded by elaborate religious rituals, with many regional variations.
 The log is kept burning throughout Christmas Day.
A twelve-dish Christmas Eve supper is traditionally prepared in many Central European and Northern European cultures, especially those that were formerly part of the Polish-Lithuanian Commonwealth, including Polish, Lithuanian, Ukrainian and Belarusian.
 The meal (Belarusian: Kуцьця , Lithuanian: Kūčios , Polish: "Wigilia " , or "wieczerza wigilijna", ) consists of twelve meatless dishes representing the twelve months of the year.
 The tradition of the supper can be traced back to pre-Christian times and connected with remembrance of the souls of deceased ancestors.
Poppy milk ("aguonų pienas") is a traditional Lithuanian drink or soup, one of the 12-dishes Christmas Eve Supper Kūčios.
 Usually it is eaten together with "kūčiukai", another traditional Lithuanian Christmas Eve dish.
Sagan om Karl-Bertil Jonssons julafton (English: Christopher's Christmas Mission ) is a 1975 Swedish animated short film directed by Per Åhlin, adapted from Tage Danielsson's short story of the same name, telling the tale of a boy who steals Christmas gifts from the wealthy to give to the poor people of Stockholm while working in a post office on Christmas Eve.
 The film has gained huge popularity in Sweden, and is broadcast every Christmas Eve on Swedish and Norwegian national television.
 It is also often shown on Christmas Eve by FST in Finland.
Kūčios (] ) or Kūtės (Samogitian Dialect) is the traditional Christmas Eve dinner in Lithuania, held on the twenty fourth of December.
 The meal is a family occasion which includes many traditions of both pagan and Christian origin.
 Some traditions are no longer widespread and usually Lithuanians just enjoy dinner with relatives and friends while the main events and festivities are left for Christmas Day.
Budnik (transliterated), (Bulgarian: Бъдник ), refers to a log brought into the house and placed on the fire on the evening of Christmas Eve, a central tradition in Slavic Christmas celebrations in Bulgaria, Bosnia and Herzegovina, Croatia, Serbia, and Montenegro, much like a yule log in other European traditions (in the Bulgarian, Croatian, and Serbian languages, the name for Christmas Eve is derived from the term "badnjak" or "budnik") as well as the Bulgarian name for Christmas Eve ().
 The tree from which the log is cut, preferably a young and straight oak, is ceremonially felled early on the morning of Christmas Eve.
 The felling, preparation, bringing in, and laying on the fire, are surrounded by elaborate rituals, with many regional variations.
Wigilia (] ) is the traditional Christmas Eve vigil supper in Poland, held on December 24.
 The term is often applied to the whole day of the Christmas Eve, extending further into Pasterka, the midnight Mass held at Roman Catholic churches all over Poland and in large Polish communities worldwide at midnight preceding the Christmas Day.
 In this usage, the supper itself is rather called "wieczerza" or "wieczerza wigilijna", using an Old Polish word meaning "dinner" or "large supper", stemming from Proto-Indo-European root *"vesper" - "evening".
 The Last Supper translates into Polish as "ostatnia wieczerza".
Christmas in Russia (Russian: Рождество Христово "Rozhdestvo Khristovo", in the Russian Orthodox Church called Е́же по пло́ти Рождество Господа Бога и Спа́са нашего Иисуса Христа) is celebrated on 7 January and marks the birthday of Jesus Christ.
 Christmas is regarded mainly as a religious event in Russia.
 On Christmas Eve (6 January), there are several long services, including the Royal Hours and Vespers combined with the Divine Liturgy.
 The family will then return home for the traditional Christmas Eve "Holy Supper", which consists of 12 dishes, one to honor each of the Twelve Apostles.
 Devout families will then return to church for the "всенощная" All Night Vigil.
 Then again, on Christmas Morning, for the "заутренняя" Divine Liturgy of the Nativity.
 Since 1992 Christmas has become a national holiday in Russia, as part of the ten-day holiday at the start of every new year.