Question: When did Chopin return to the city located in the same county as Etna Township?

full_context: Document 1: Hamilton Southeastern High School: Hamilton Southeastern High School (HSE or HSHS) is a four-star, former Blue Ribbon public high school in Fishers, Indiana, United States. It is a part of the Hamilton Southeastern School District.
Document 2: Warsaw Community High School: Warsaw Community High School is a public high school located in Warsaw, Indiana, the county seat of Kosciusko County. It is in the Warsaw Community Schools Corporation. The school's principal is Troy Akers. The current building located on State Road 15 was built in 1990.
Document 3: Etna Township, Kosciusko County, Indiana: Etna Township is one of seventeen townships in Kosciusko County, Indiana. As of the 2010 census, its population was 1,503 and it contained 540 housing units.
Document 4: Frédéric Chopin: From September 1823 to 1826 Chopin attended the Warsaw Lyceum, where he received organ lessons from the Czech musician Wilhelm Würfel during his first year. In the autumn of 1826 he began a three-year course under the Silesian composer Józef Elsner at the Warsaw Conservatory, studying music theory, figured bass and composition.[n 3] Throughout this period he continued to compose and to give recitals in concerts and salons in Warsaw. He was engaged by the inventors of a mechanical organ, the "eolomelodicon", and on this instrument in May 1825 he performed his own improvisation and part of a concerto by Moscheles. The success of this concert led to an invitation to give a similar recital on the instrument before Tsar Alexander I, who was visiting Warsaw; the Tsar presented him with a diamond ring. At a subsequent eolomelodicon concert on 10 June 1825, Chopin performed his Rondo Op. 1. This was the first of his works to be commercially published and earned him his first mention in the foreign press, when the Leipzig Allgemeine Musikalische Zeitung praised his "wealth of musical ideas".
Document 5: Jefferson Township, Kosciusko County, Indiana: Jefferson Township is one of seventeen townships in Kosciusko County, Indiana. As of the 2010 census, its population was 2,040 and it contained 677 housing units.
Document 6: New Palestine High School: New Palestine High School is a rural public high school (grades 9 - 12) located in New Palestine, Indiana, managed by the Community School Corporation of Southern Hancock County. As of the 2016 - 2017 school year it serves 1,137 students and employed 61 faculty members.
Document 7: Frédéric Chopin: At the end of 1831, Chopin received the first major endorsement from an outstanding contemporary when Robert Schumann, reviewing the Op. 2 Variations in the Allgemeine musikalische Zeitung (his first published article on music), declared: "Hats off, gentlemen! A genius." On 26 February 1832 Chopin gave a debut Paris concert at the Salle Pleyel which drew universal admiration. The critic François-Joseph Fétis wrote in the Revue et gazette musicale: "Here is a young man who ... taking no model, has found, if not a complete renewal of piano music, ... an abundance of original ideas of a kind to be found nowhere else ..." After this concert, Chopin realized that his essentially intimate keyboard technique was not optimal for large concert spaces. Later that year he was introduced to the wealthy Rothschild banking family, whose patronage also opened doors for him to other private salons (social gatherings of the aristocracy and artistic and literary elite). By the end of 1832 Chopin had established himself among the Parisian musical elite, and had earned the respect of his peers such as Hiller, Liszt, and Berlioz. He no longer depended financially upon his father, and in the winter of 1832 he began earning a handsome income from publishing his works and teaching piano to affluent students from all over Europe. This freed him from the strains of public concert-giving, which he disliked.
Document 8: Monroe Township, Kosciusko County, Indiana: Monroe Township is one of seventeen townships in Kosciusko County, Indiana. As of the 2010 census, its population was 1,147 and it contained 473 housing units.
Document 9: Center Township, Marion County, Indiana: Center Township is one of nine townships in Marion County, Indiana, in the United States. As of the 2010 census, its population was 142,787 and it contained 76,872 housing units. It is the most populated township in Marion County.
Document 10: Center Township, Hancock County, Indiana: Center Township is one of nine townships in Hancock County, Indiana, United States. As of the 2010 census, its population was 25,819 and it contained 10,909 housing units.
Document 11: WNAS: WNAS (88.1 FM) is the student-run high school radio station of New Albany High School and Floyd Central High School in southern Indiana, (along with WNAS-TV). The station's call letters, WNAS, reflect the ownership by the New Albany Floyd County School Corporation. The first FM student-run high school radio station to be licensed by the Federal Communications Commission (FCC), WNAS has been broadcasting live since May 28, 1949.
Document 12: Frédéric Chopin: Although it is not known exactly when Chopin first met Liszt after arriving in Paris, on 12 December 1831 he mentioned in a letter to his friend Woyciechowski that "I have met Rossini, Cherubini, Baillot, etc.—also Kalkbrenner. You would not believe how curious I was about Herz, Liszt, Hiller, etc." Liszt was in attendance at Chopin's Parisian debut on 26 February 1832 at the Salle Pleyel, which led him to remark: "The most vigorous applause seemed not to suffice to our enthusiasm in the presence of this talented musician, who revealed a new phase of poetic sentiment combined with such happy innovation in the form of his art."
Document 13: Frédéric Chopin: Chopin took the new salon genre of the nocturne, invented by the Irish composer John Field, to a deeper level of sophistication. He was the first to write ballades and scherzi as individual concert pieces. He essentially established a new genre with his own set of free-standing preludes (Op. 28, published 1839). He exploited the poetic potential of the concept of the concert étude, already being developed in the 1820s and 1830s by Liszt, Clementi and Moscheles, in his two sets of studies (Op. 10 published in 1833, Op. 25 in 1837).
Document 14: Winnacunnet High School: Winnacunnet High School is an American public high school located in Hampton, New Hampshire. It serves students in grades 9 through 12 who live in the communities of Hampton, Seabrook, North Hampton, and Hampton Falls. Students from South Hampton attend Amesbury High School. The name "Winnacunnet" is a Native American word that means "beautiful place in the pines". The current principal, since 2010, is William McGowan.
Document 15: Frédéric Chopin: Back in Warsaw that year, Chopin heard Niccolò Paganini play the violin, and composed a set of variations, Souvenir de Paganini. It may have been this experience which encouraged him to commence writing his first Études, (1829–32), exploring the capacities of his own instrument. On 11 August, three weeks after completing his studies at the Warsaw Conservatory, he made his debut in Vienna. He gave two piano concerts and received many favourable reviews—in addition to some commenting (in Chopin's own words) that he was "too delicate for those accustomed to the piano-bashing of local artists". In one of these concerts, he premiered his Variations on Là ci darem la mano, Op. 2 (variations on an aria from Mozart's opera Don Giovanni) for piano and orchestra. He returned to Warsaw in September 1829, where he premiered his Piano Concerto No. 2 in F minor, Op. 21 on 17 March 1830.
ground_truth: September 1829
sub_queries: Etna Township >> located in the administrative territorial entity Answer: Kosciusko County
Kosciusko County >> contains administrative territorial entity Answer: Warsaw
When did Chopin return to Warsaw ? Answer: September 1829