Events January January 3 – Theodoros Pangalos declares himself dictator in Greece. January 8 Abdul-Aziz ibn Saud is crowned King of Hejaz. Crown Prince Nguyễn Phúc Vĩnh Thuy ascends the throne, the last monarch of Vietnam. January 12 – Freeman Gosden and Charles Correll premiere their radio program Sam 'n' Henry, in which the two white performers portray two black characters from Harlem looking to strike it rich in the big city (it is a precursor to Gosden and Correll's more popular later program, Amos 'n' Andy). January 16 – A BBC comic radio play broadcast by Ronald Knox, about a workers' revolution, causes a panic in London. January 21 – The Belgian Parliament accepts the Locarno Treaties. January 26 – Scottish inventor John Logie Baird demonstrates a mechanical television system at his London laboratory for members of the Royal Institution and a reporter from The Times. January 29 – Eugene O'Neill's The Great God Brown opens at the Greenwich Theatre in New York City. January 31 – British and Belgian troops leave Cologne. February February 1 – Land on Broadway and Wall Street in New York City is sold at a record $7 per sq inch; it is only affordable for four more years. February 8 – Seán O'Casey's The Plough and the Stars opens at the Abbey Theatre in Dublin. February 12 – The Irish minister for Justice, Kevin O'Higgins, appoints the Committee on Evil Literature. February 20 – The Berlin International Green Week debuts in Germany. February 25 – Francisco Franco becomes General in Spain. March March 6 The Shakespeare Memorial Theatre in Stratford-upon-Avon (England) is destroyed by fire. The first commercial air route from the United Kingdom to South Africa is established by Alan Cobham. March 14 – The El Virilla train accident occurs in Costa Rica killing 248 people and injuring 93. March 16 – Robert H. Goddard launches the first liquid-fuel rocket, at Auburn, Massachusetts. March 23 – Éamon de Valera organises the political party Fianna Fáil in Ireland. April April 4 – Greek dictator Theodoros Pangalos wins the presidential election, with 93.3% of the vote; turnout is light, as the result is considered a foregone conclusion. April 7 – An assassination attempt against Italian Fascist leader Benito Mussolini fails. April 17 – Zhang Zuolin's army captures Beijing. April 24 – Treaty of Berlin: Germany and the Soviet Union each pledge neutrality, in the