Births on May 27

Ian Tracey, English organist and conductor

Ian Graham Tracey DL (born 27 May 1955) is an English concert organist who has served as organist titulaire of Liverpool Cathedral since 2008.

7 Jan

Metropolitan Opera
Contralto Marian Anderson becomes the first person of color to perform at the Metropolitan Opera in Giuseppe Verdi's Un ballo in maschera.
13 Feb

Dead Sea Scrolls
Israel obtains four of the seven Dead Sea Scrolls.
18 Feb

Nevada Test Site
Operation Teapot: Teapot test shot "Wasp" is successfully detonated at the Nevada Test Site with a yield of 1.2 kilotons. Wasp is the first of fourteen shots in the Teapot series.
14 May

Warsaw Pact
Cold War: Eight Communist bloc countries, including the Soviet Union, sign a mutual defense treaty called the Warsaw Pact.
23 Oct

State of Vietnam referendum, 1955
Prime Minister Ngô Đình Diệm defeats former emperor Bảo Đại in a referendum and founds the Republic of Vietnam.