If you mean 1956, it was the Suez Crisis. I don't know of any major event that happened in 1957 except for Harold MacMillan becoming Prime Minister, the end of petrol rationing following the Suez Crisis and the publishing of the Wolfenden report which recommended the decriminalisation of homosexuality.
Some 1957 Stuff: 1957 - 1958 Influenza pandemic in Southern China Ghana gains independence in March 1957 from the UK The European Economic Community is established in March 1957 The UK makes Singapore independent in April 1957 Tunisia becomes a republic, abolishing the monarchy in July 1957 Segregationist Strom Thurmond sets the longest filibuster in US Senate history in August 1957 Malaysia gains independence from the UK in August 1957 Jamaica has its worst railway disaster in its history in September 1957 First US satellite attempt fails in December 1957
The Crooked Sky - 1957 was released on: UK: April 1957 USA: November 1957
Hour of Decision - 1957 was released on: USA: April 1957 UK: May 1957
Fortune Is a Woman - 1957 was released on: UK: 13 March 1957 (London) (premiere) UK: 15 April 1957 Finland: 19 July 1957 Sweden: 18 November 1957 Denmark: 24 November 1957 Belgium: December 1957 France: 11 December 1957 USA: 8 July 1958
Date with Disaster - 1957 was released on: UK: July 1957 USA: 1958
The Traitor - 1957 was released on: UK: March 1957 USA: 13 July 1958
In 1957 frisbees were first sold in store as a toy.
Sword of Freedom - 1957 was released on: USA: 1957 UK: 21 February 1959
African Patrol - 1957 was released on: USA: 1957 UK: 5 April 1958
The Betrayal - 1957 was released on: UK: 1957 USA: 1958 Mexico: 22 October 1964
The New Adventures of Charlie Chan - 1957 Backfire 1-15 was released on: USA: 1957 UK: 14 September 1957 UK: 15 December 1961 (re-release)
The New Adventures of Charlie Chan - 1957 The Counterfeiters 1-6 was released on: USA: 1957 UK: 12 October 1957 UK: 22 January 1961 (re-release)