Question: Where did the opera in which Iva Pacetti starred as Elena first premier?

<P0-S0> Marc-Amable Girard (April 25, 1822 – September 12, 1892) was the second Premier of the Western Canadian province of Manitoba, and the first Franco-Manitoban to hold that post. <P0-S1>  The "Canadian Parliamentary Guide" lists Girard as having been Premier (or "Chief Minister") from 1871 to 1872, but he did not have this title at the time and was not the government leader. <P0-S2>  In 1874, however, Girard led Manitoba's first ministry to be constituted on principles of "responsible government". <P0-S3>  In this sense, he may be regarded as the first Premier of Manitoba. <SEP> <P1-S0> Mefistofele (] ) is an opera in a prologue, four acts and an epilogue, the only completed opera with music by the Italian composer-librettist Arrigo Boito (there are several completed operas for which he was librettist only). <P1-S1>  The opera was given its premiere on 5 March 1868 at La Scala, Milan, under the baton of the composer, despite his lack of experience and skill as a conductor. <SEP> <P2-S0> Chief Obafemi Jeremiah Oyeniyi Awolowo, GCFR (Yoruba: "Ọbáfẹ́mi Awólọ́wọ̀" ; 6 March 1909 – 9 May 1987), was a Nigerian nationalist and statesman who played a key role in Nigeria's independence movement, the First and Second Republics and the Civil War. <P2-S1>  He was the first premier of the Western Region and later federal commissioner for finance, and vice chairman of the Federal Executive Council during the Civil War. <P2-S2>  He was thrice a major contender for his country's highest office. <P2-S3>  A native of Ikenne in Ogun State of south-western Nigeria, he started his career, like some of his well-known contemporaries, as a nationalist in the Nigerian Youth Movement in which he rose to become Western Provincial Secretary. <P2-S4>  Awolowo was responsible for much of the progressive social legislation that has made Nigeria a modern nation. <P2-S5>  He was the first Leader of Government Business and Minister of Local Government and Finance, and first Premier of the Western Region under Nigeria's parliamentary system, from 1952 to 1959. <P2-S6>  He was the official Leader of the Opposition in the federal parliament to the Balewa government from 1959 to 1963. <P2-S7>  In recognition of all these, Awolowo was the first individual in the modern era to be named "Leader of the Yorubas" (Yoruba: Asiwaju Awon Yoruba or Asiwaju Omo Oodua). <SEP> <P3-S0> Iva Pacetti (13 December 1898, Prato - 19 January 1981, Milan) was an Italian operatic soprano who had an active international career from 1920-1947. <P3-S1>  She reprised the role the following year at Loew's Lexington Theatre in New York City. <P3-S2>  Trained in Florence and Milan, she made her professional opera debut in her native city at the age of 21 as the title heroine in Giuseppe Verdi's "Aida" at the Teatro Metastasio. <P3-S3>  In 1922 she had a triumphant success at the Teatro Carlo Felice as Elena in Arrigo Boito's "Mefistofele". <P3-S4>  Engagements with other important opera houses soon followed, including La Scala, the Teatro Costanzi, the Teatro di San Carlo, the Opéra de Monte-Carlo, the Chicago Civic Opera, the Teatro Colón, the Teatro Municipal in Rio de Janeiro, and the Theatro Municipal in São Paulo. <P3-S5>  From 1930-1933 she was committed to the Royal Opera House in London, portraying such roles as Desdemona in "Otello", Leonora in "La forza del destino", and the title role in "Tosca". <P3-S6>  The latter years of her career were spent performing primarily at La Scala where she was a frequent partner of Beniamino Gigli. <P3-S7>  She retired from the stage in 1947, after which she was active as a voice teacher in Milan.