Question: What series of settlements celebrated their feast day on 30 September?

Context articles: La Mercè
Allantide
Anathalon
Virgin of Candelaria
The Feast of All Saints of Russia
Baptism of the Lord
Saint Lucy's Day
Cucuphas
The Deepings
Tancred, Torthred, and Tova

La Mercè (] ) is the annual festival (Catalan: "festa major" ) of the city of Barcelona in Catalonia, Spain.
 It has been an official city holiday since 1871, when the local government first organized a program of special activities to observe the Roman Catholic feast day of Our Lady of Mercy, "La Mare de Déu de la Mercè" in Catalan.
 Although the actual feast day is September 24, the festivities begin a few days beforehand.
Allantide (Cornish: "Kalan Gwav" , meaning "first day of winter", or "Nos Kalan Gwav", meaning "eve of the first day of winter" and "Dy' Halan Gwav", meaning "day of the first day of winter"), also known as Saint Allan's Day or the Feast of Saint Allan, is a Cornish festival that was traditionally celebrated on the night of 31st October, as well as the following day time, and known elsewhere as Allhallowtide.
 The festival, in Cornwall is the liturgical feast day of St Allan (also spelled St Allen or St Arlan), who was the bishop of Quimper in the sixth century.
 As such, Allantide is also known as Allan Night and Allan Day.
 The origins of the name Allantide also probably stem from the same sources as Hollantide (Wales and the Isle of Man) and Hallowe'en itself.
Anathalon (or "Anatalius", "Anatolius", Italian: "Anatalone, Anatalo, Anatolio" , Byzantine Greek: "Ανατόλιος") was the first recorded Bishop of Milan and lived at the end 2nd-century or early 3rd-century.
 He is honoured as a Saint in the Catholic Church and his feast day is on September 25 in Milan.
 A late tradition made him the first bishop of Brescia where his feast day is celebrated on September 24.
The Virgin of Candelaria or Our Lady of Candelaria (Spanish: "Virgen de Candelaria" or "Nuestra Señora de la Candelaria"), popularly called "La Morenita", celebrates the Virgin Mary on the island of Tenerife, one of the Canary Islands (Spain).
 The center of worship is located in the city of Candelaria in Tenerife.
 She is depicted as a Black Madonna.
 The "Royal Basilica Marian Shrine of Our Lady of Candelaria" (Basilica of Candelaria), is considered the main church dedicated to the Virgin Mary in the Canary Islands.
 She is the patron saint of the Canary Islands.
 Her feast is celebrated on February 2 (Candlemas) and August 15, the patronal feast of the Canary Islands.
 She is also the patroness of Tatala, one of the barangays in Binangonan, Rizal which celebrate her feast day every First Saturday of February.
The Feast of All Saints of Russia (The Feast Day of All Russian Saints, Synaxis of All Saints, who Resplendent in the Russian land, Russian: Собор всех святых, в земле Русской просиявших ) is day of remembrance, celebrated in the Russian Orthodox Church on the second Sunday after the Feast of Pentecost.
 It dedicated to all the saints, belonging to the Russian Orthodox Church since its inception.
 It includes not only the canonized saints, but also those whose deeds remained unknown.
The Baptism of the Christ (or the Baptism of Christ) is the feast day commemorating the baptism of Jesus in the Jordan River by John the Baptist.
 Originally the baptism of Christ was celebrated on Epiphany, which commemorates the coming of the Magi, the baptism of Christ, and the wedding at Cana.
 Over time in the West, however, the celebration of the baptism of the Lord came to be commemorated as a distinct feast from Epiphany.
 It is celebrated in the Roman Catholic Church as well as the Anglican and Lutheran Churches on the first Sunday following The Epiphany of Our Lord (6 January).
Saint Lucy's Day, also called the Feast of Saint Lucy, is a Christian feast day celebrated on 13 December in Advent, commemorating Saint Lucy, a 3rd-century martyr under the Diocletianic Persecution, who according to legend brought "food and aid to Christians hiding in the catacombs" using a candle-lit wreath to "light her way and leave her hands free to carry as much food as possible".
 Her feast once coincided with the Winter Solstice, the shortest day of the year before calendar reforms, so her feast day has become a Christian festival of light.
 Falling within the Advent season, Saint Lucy's Day is viewed as an event signaling the arrival of Christmastide, pointing to the arrival of the Light of Christ in the calendar, on Christmas Day.
Saint Cucuphas (also "Cucufas" or "Qaqophas", Catalan: "Cugat, Culgat, Cougat" , Spanish: "Cucufate, Cucufato, Cocoba(s)" , French: "Cucuphat, Cucufa, Cucuphat, Quiquenfat" , Galician: "Covade, Cobad" , Occitan: "Cophan" , Asturian: "Cucao" ) is a martyr of Spain.
 His feast day is 25 July but in some areas it is celebrated on 27 July to avoid conflict with the important feast day of Santiago, the patron saint of Spain.
 His name is said to be of Phoenician origin with the meaning of "he who jokes, he who likes to joke."
The Deepings (grid reference [ TF150094] ) are a series of settlements in the south of Lincolnshire in England.
Saints Tancred, Torthred, and Tova were three Anglo-Saxon siblings who were saints, hermits and martyrs of the Ninth century.
 Their feast day was celebrated on 30 September at Thorney and Deeping.