Question: When did Chopin return to the city where Andrzej Strug died?

full_context: Document 1: Andrzej Strug: Andrzej Strug, real name Tadeusz (or Stefan) Gałecki (sources vary; 28 November 1871/1873 in Lublin – 9 December 1937 in Warsaw) was a Polish socialist politician, publicist and activist for Poland's independence. He was also a freemason and declined the offer to join the prestigious Polish Academy of Literature, upset by official criticism of the movement.
Document 2: Frédéric Chopin: Four boarders at his parents' apartments became Chopin's intimates: Tytus Woyciechowski, Jan Nepomucen Białobłocki, Jan Matuszyński and Julian Fontana; the latter two would become part of his Paris milieu. He was friendly with members of Warsaw's young artistic and intellectual world, including Fontana, Józef Bohdan Zaleski and Stefan Witwicki. He was also attracted to the singing student Konstancja Gładkowska. In letters to Woyciechowski, he indicated which of his works, and even which of their passages, were influenced by his fascination with her; his letter of 15 May 1830 revealed that the slow movement (Larghetto) of his Piano Concerto No. 1 (in E minor) was secretly dedicated to her – "It should be like dreaming in beautiful springtime – by moonlight." His final Conservatory report (July 1829) read: "Chopin F., third-year student, exceptional talent, musical genius."
Document 3: Andrzej Jastrzębiec: Andrzej Jastrzębiec, also known as Andrzej Wasilko or Andrzej Polak, (died 1398) was a Polish Catholic priest and diplomat, a first bishop of Seret and of Vilnius. Little is known of his youth and he might have been born to a peasant family. He joined the Franciscans and quickly rose through the ranks of the order.
Document 4: Tadeusz Bielecki: Tadeusz Bielecki (born January 30, 1901 in Słupia - February 5, 1982 in London) was a Polish politician and writer. Personal secretary to Roman Dmowski, member of the National Party (Stronnictwo Narodowe) and Camp of Great Poland (Obóz Wielkiej Polski); he was however opposed to radicals from National Radical Camp (Obóz Narodowo-Radykalny). He fought in the Polish September Campaign, then escaped occupied Poland to join the National Council of Poland. He was a vocal opponent of Władysław Sikorski's policies in the Polish government in exile. After the war he remained in emigration, where he was a member of the Political Council and the Council of National Unity.
Document 5: 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.
Document 6: Szlachta: There were a number of avenues to upward social mobility and the achievement of nobility. Poland's nobility was not a rigidly exclusive, closed class. Many low-born individuals, including townsfolk, peasants and Jews, could and did rise to official ennoblement in Polish society. Each szlachcic had enormous influence over the country's politics, in some ways even greater than that enjoyed by the citizens of modern democratic countries. Between 1652 and 1791, any nobleman could nullify all the proceedings of a given sejm (Commonwealth parliament) or sejmik (Commonwealth local parliament) by exercising his individual right of liberum veto (Latin for "I do not allow"), except in the case of a confederated sejm or confederated sejmik.
Document 7: Andrzej Sławiński: Andrzej Sławiński (born July 31, 1951 in Warsaw) is a Polish economist and Professor of Economics at the Warsaw School of Economics. He is a member of the Council of Monetary Policies since 2004 and a fellow of Collegium Invisibile.
Document 8: Frédéric Chopin: Possibly the first venture into fictional treatments of Chopin's life was a fanciful operatic version of some of its events. Chopin was written by Giacomo Orefice and produced in Milan in 1901. All the music is derived from that of Chopin.
Document 9: 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 10: 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 11: Andrzej Walkowiak: He was elected to Sejm on 25 September 2005, getting 5203 votes in 4 Bydgoszcz district, standing for Law and Justice (PiS). He joined Poland Comes First when that party split from PiS in 2010.
Document 12: Maurycy Mochnacki: Maurycy Mochnacki was born in a part of Poland annexed by Russian, where people were tired with everyday brutality, censorship, arrests and imprisonments. They dreamed of a free independent country and cultivated their own tradition, customs and the inner spiritual life. Mochnacki came from a patriotic and political active family. Mochnacki's father - lawyer, land-owner and participant of the Kościuszko Insurrecton in 1794, wanted to give his children the best education. At the beginning, Maurycy learned classical and contemporary literature, history and foreign languages at home. In 1815, the family moved to Lviv, where he took music classes and also played the piano and the violin. In 1819, the family settled down in the town of Czersk near Warsaw. First, Maurycy studied in a prestigious high school in Warsaw then, he started law studies at Warsaw University, but was expelled very soon for striking a policeman who requested him to extinguish his pipe. In a further blow to the family's reputation, he was sentenced to 14 days hard labour, working with criminal offenders in the Belvedere Park. At the end of 1823, he was arrested and imprisoned in the Carmelite Convent for belonging to a secret organization called ‘the Union of Free Polish Brothers’. To get the freedom, he had to write a memorial in which he accused the education system in the Congress Kingdom of early political education for young people and disastrous liberalism. Shortly after his release, he was forced to work at censorship office but lost the job after six months. Those episodes would have a profound influence on his future life.
Document 13: Jerzy Żuławski: In a twenty-year writing career, from his first book of poems in 1895, at the age of 21, to his final World War I dispatches in 1915, Jerzy Żuławski created an impressive body of work—seven volumes of poetry, three collections of literary criticism, numerous cultural and philosophical essays, ten plays and five novels. He was considered an important and influential intellectual figure in the early years of the 20th century, but a century later, the only creation which has remained in print and assured him literary immortality is "The Lunar Trilogy". Stanisław Lem (1921–2006), renowned as the "most widely read science-fiction writer in the world", contributed an introduction to the 1956 and 1975 editions of the "Trilogy"'s initial volume, "Na Srebrnym Globie" ("On the Silver Globe"), crediting Żuławski's words with inspiring him to become "a writer of the fantastic" and describing the time he spent reading "The Lunar Trilogy" as "one of the most fascinating and life-changing experiences" of his youth.
Document 14: 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 15: 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.
ground_truth: September 1829
sub_queries: At what location did Andrzej Strug die? Answer: Warsaw
When did Chopin return to Warsaw ? Answer: September 1829