including the Royal Festival Hall. The U.S. Senate Committee on Armed Services and U.S. Senate Committee on Foreign Relations begin their closed door hearings into the dismissal of General Douglas MacArthur by U.S. President Harry S Truman. May 8 – Operation Greenhouse: The first thermonuclear weapon is tested in the "George" test on Enewetok Atoll in the Marshall Islands by the United States. May 14 – The first volunteer-run passenger trains run on the Talyllyn Railway in Wales. May 15 – A military coup occurs in Bolivia. May 21 – The 9th Street Art Exhibition, otherwise known as the Ninth Street Show, a gathering of a number of notable artists, marks the stepping-out of the postwar New York avant-garde, collectively known as the New York School. May 23 – The Tibetan government signs the Seventeen Point Agreement for the Peaceful Liberation of Tibet with the People's Republic of China. May 24 – Operation Greenhouse: The first atomic bomb "boosted" by the inclusion of tritium is tested in the "Item" test on Enewetok Atoll in the Marshall Islands by the United States. May 25–26 – British spies Guy Burgess and Donald Maclean leave the United Kingdom to defect to the Soviet Union. May 28 – The Goon Show is first broadcast on BBC Home Service in the U.K.; the first series is entitled "Crazy People". June June 4 – The Foley Square trial concludes review in the U.S. Supreme Court as Dennis v. United States, with a ruling against the defendants (overturned by Yates v. United States in 1957). June 7 - Nazi war criminal Otto Ohlendorf is hung at Landsberg Prison, Bavaria. June 14 – UNIVAC I is dedicated by the U.S. Census Bureau. June 15–July 1 – In New Mexico, Arizona, California, Oregon, Washington and British Columbia, thousands of acres of forests are destroyed in fires. July July 1 Colombo Plan operations commence. Judy Garland opens the first of 14 concerts in Dublin, Ireland at the Theatre Royal. July 5 – William Shockley, John Bardeen and Walter Brattain, of Bell Labs, announce the invention of the grown-junction transistor. Same year, General Electric and RCA develop alloy-junction transistor. July 10 Korean War: Armistice negotiations begin at Kaesong. A formal peace agreement between Canada and Germany is signed. July 13 The Great Flood of 1951 reaches its highest point in northeast Kansas, culminating in the greatest flood damage to date in