Question: Why did Roncalli leave the place where the composer of Al gran sole carico d'amore worked?

Knowledge 1: Al gran sole carico d'amore
Al gran sole carico d'amore ("In the Bright Sunshine Heavy with Love") is an opera (designated as an 'azione scenica') with music by Luigi Nono, based mainly on plays by Bertolt Brecht, but also incorporating texts of Fidel Castro, Che Guevara, Karl Marx, and Vladimir Lenin. Nono himself and Yuri Lyubimov wrote the libretto. It premiered at the Teatro alla Scala on 4 April 1975, conducted by Claudio Abbado. Lyubimov directed the original production. The UK premiere was at the 32nd Edinburgh Festival in 1978. In addition to vocal soloists, chorus and orchestra, the work incorporates taped sounds. This work is a product of Nono's strong political activism through the mid-1970s. [SEP] Knowledge 2: Alessandro Zezzos
He studied under Giacomo Favretto, Alessandro Milesi, and Luigi Nono at the Academy of Fine Arts in his native Venice. In 1873, he exhibited in Venice: "Né sposo né figlio" and "Scena famigliare". In 1877 at Paris, "Les saltimbanques" and "Les pingeons de Saint Marc". He was active as a painter in Venice. Among his watercolors are "Le rondini", exhibited at 1880 at Turin; "Una calle", exhibited at the 1891 Mostra Triennale of the Brera Academy. In 1881 at Milan, displayed the paintings: "Mercante di ventagli"; "At the Predica", "Half-figure of a Girl"; and "Popolana". In 1883 in Rome, exhibited: "The Lovers". He painted "Love Letter", "Una fuga nel 1700"; and "The Dockside of San Marco". He sent to Paris in 1877-1878, the paintings: "Pigeons of St Mark", "El-Mazrama" (Mouchoir of the Sultan), "Los Saltimbanques", and "A venetian - A Daughter of the People". [SEP] Knowledge 3: Pope John XXIII
Following the death of Pope Pius XII on 9 October 1958, Roncalli watched the live funeral on his last full day in Venice on 11 October. His journal was specifically concerned with the funeral and the abused state of the late pontiff's corpse. Roncalli left Venice for the conclave in Rome well aware that he was papabile,[b] and after eleven ballots, was elected to succeed the late Pius XII, so it came as no surprise to him, though he had arrived at the Vatican with a return train ticket to Venice.[citation needed]
Knowledge 1: Al gran sole carico d'amore
Al gran sole carico d'amore ("In the Bright Sunshine Heavy with Love") is an opera (designated as an 'azione scenica') with music by Luigi Nono, based mainly on plays by Bertolt Brecht, but also incorporating texts of Fidel Castro, Che Guevara, Karl Marx, and Vladimir Lenin. Nono himself and Yuri Lyubimov wrote the libretto. It premiered at the Teatro alla Scala on 4 April 1975, conducted by Claudio Abbado. Lyubimov directed the original production. The UK premiere was at the 32nd Edinburgh Festival in 1978. In addition to vocal soloists, chorus and orchestra, the work incorporates taped sounds. This work is a product of Nono's strong political activism through the mid-1970s. [SEP] Knowledge 2: Pope John XXIII
Following the death of Pope Pius XII on 9 October 1958, Roncalli watched the live funeral on his last full day in Venice on 11 October. His journal was specifically concerned with the funeral and the abused state of the late pontiff's corpse. Roncalli left Venice for the conclave in Rome well aware that he was papabile,[b] and after eleven ballots, was elected to succeed the late Pius XII, so it came as no surprise to him, though he had arrived at the Vatican with a return train ticket to Venice.[citation needed] [SEP] Knowledge 3: Pope John XXIII
In February 1939, he received news from his sisters that his mother was dying. On 10 February 1939, Pope Pius XI died. Roncalli was unable to see his mother for the end as the death of a pontiff meant that he would have to stay at his post until the election of a new pontiff. Unfortunately, she died on 20 February 1939, during the nine days of mourning for the late Pius XI. He was sent a letter by Cardinal Eugenio Pacelli, and Roncalli later recalled that it was probably the last letter Pacelli sent until his election as Pope Pius XII on 2 March 1939. Roncalli expressed happiness that Pacelli was elected, and, on radio, listened to the coronation of the new pontiff.
Knowledge 1: Al gran sole carico d'amore
Al gran sole carico d'amore ("In the Bright Sunshine Heavy with Love") is an opera (designated as an 'azione scenica') with music by Luigi Nono, based mainly on plays by Bertolt Brecht, but also incorporating texts of Fidel Castro, Che Guevara, Karl Marx, and Vladimir Lenin. Nono himself and Yuri Lyubimov wrote the libretto. It premiered at the Teatro alla Scala on 4 April 1975, conducted by Claudio Abbado. Lyubimov directed the original production. The UK premiere was at the 32nd Edinburgh Festival in 1978. In addition to vocal soloists, chorus and orchestra, the work incorporates taped sounds. This work is a product of Nono's strong political activism through the mid-1970s. [SEP] Knowledge 2: Alessandro Zezzos
He studied under Giacomo Favretto, Alessandro Milesi, and Luigi Nono at the Academy of Fine Arts in his native Venice. In 1873, he exhibited in Venice: "Né sposo né figlio" and "Scena famigliare". In 1877 at Paris, "Les saltimbanques" and "Les pingeons de Saint Marc". He was active as a painter in Venice. Among his watercolors are "Le rondini", exhibited at 1880 at Turin; "Una calle", exhibited at the 1891 Mostra Triennale of the Brera Academy. In 1881 at Milan, displayed the paintings: "Mercante di ventagli"; "At the Predica", "Half-figure of a Girl"; and "Popolana". In 1883 in Rome, exhibited: "The Lovers". He painted "Love Letter", "Una fuga nel 1700"; and "The Dockside of San Marco". He sent to Paris in 1877-1878, the paintings: "Pigeons of St Mark", "El-Mazrama" (Mouchoir of the Sultan), "Los Saltimbanques", and "A venetian - A Daughter of the People". [SEP] Knowledge 3: Tabula Rogeriana
The Nuzhat al-mushtāq fi'khtirāq al-āfāq (, lit. "the book of pleasant journeys into faraway lands"), most often known as the Tabula Rogeriana (lit. "The Book of Roger" in Latin), is a description of the world and world map created by the Arab geographer Muhammad al-Idrisi in 1154. Al-Idrisi worked on the commentaries and illustrations of the map for fifteen years at the court of the Norman King Roger II of Sicily, who commissioned the work around 1138.

Answer: for the conclave in Rome