February 19 - During a public ceremony at the Viceregal Palace (the former Imperial residence) in Addis Ababa, Ethiopia, two Eritrean nationalists attempt to kill viceroy Rodolfo Graziani with a number of grenades. The Italian security guard fire into the crowd of Ethiopian onlookers, and over the passing weeks indiscriminately slaughter native Ethiopians in reprisal.
March - The first issue of the Comic bookDetective Comics is published in the United States. Twenty-seven issues later, Detective Comics would introduce Batman. The comic would go on to become the longest continually-published comic magazine in American history; it is still published as of 2005.
May 21 - As one of the reprisals for the attempted assassination of Italian viceroy Rodolfo Graziani, a detachment of Italian troops massacre the entire community of Debre Libanos. 297 monks and 23 laymen are killed.
May - Dáil Éireann passes the Executive Authority (Consequential Provisions) Act, 1937 which retrospectively abolishes the office of Governor-General of the Irish Free State. The abolition is retrospectively dated to December 1936.
June
June 8 - First total Solar eclipse to exceed 7 minutes of totality in over 800 years; visible in the Pacific and Peru.
June/July - Dáil Éireann debates and passes the draft new constitution of Éire, to be called Bunreacht na hÉireann. The new constitution is then submitted for public approval by plebiscite.
December 29 - New Irish Constitution, Bunreacht na hÉireann comes into force. The Irish Free State becomes Éire. Eamon de Valera becomes the first Taoiseach (prime minister) of the new state. A Presidential Commission (made up the Irish Chief Justice, the Speaker of Dáil Éireann and the President of the High Court) assumes the powers of the new presidency of Ireland pending the election of the first president in June 1938.
December - The Marijuana Tax Act is signed, ending the US Hemp industry just as it was about to benefit from a mechanised brake and compete with Cotton and wood pulp.