1956 was a leap year.
February 25 - At the end of the 20th Congress of the Communist Party of the USSR, Nikita Khrushchev read a Secret Paper, in which he presented the consequences of Stalin's rule and the cult of personality.
April 7 - Spain relinquishes its protectorate in Morocco.
May 20 - Americans carry out the first explosion of a hydrogen bomb dropped from a plane over the Pacific island of Bikini.
June 13 - The last British troops leave the base near the Suez Canal, which was ruled by Great Britain for 74 years.
June 23 - Colonel Gamal Abdel Nasser is elected President of Egypt.
June 28-30. June - Poznan June
July 1 - The first experimental TV broadcast was broadcast in Belgrade.
July 19 - The leaders of Yugoslavia, India and Egypt - Josip Broz Tito, Jawaharlal Nehru and Gamal Abdel Nasser - sign the Brioni Declaration on a Common Anti-Bloc Policy, marking the beginning of the Non-Aligned Movement.
July 26 - Egyptian President Gamal Abdel Nasser nationalizes the Suez Canal, which was controlled by an Anglo-French company.
October 23 - An anti-communist uprising begins in Hungary with street demonstrations.
October 29 - The Suez Crisis begins with an Israeli army attack on the Sinai Peninsula.
November 4 - Soviet troops occupy Budapest during the suppression of the uprising in Hungary, and Janos Kadar is appointed the new prime minister.
November 7 - The United Nations General Assembly passes a resolution ordering Britain, France and Israel to withdraw troops from Egypt.
November 5 - British paratroopers land on Port Said during the British-French-Israeli aggression on Egypt.
November 10 - Soviet troops end anti-communist uprising in Hungary.
December 2 - Fidel Castro disembarks in Cuba with a small group of revolutionaries and begins a struggle that ends with the overthrow of Batista's regime.
Wikipedia: Unknown date - A big chess tournament "Alekhine Memorial Tournament" was held in Moscow, Soviet Union, and the winners were Mikhail Botvinik and Vasily Smislov.