Events in the year 1958 in Belgium. Incumbents Monarch – Baudouin Prime Minister – Achille Van Acker (to 26 June); Gaston Eyskens (from 26 June) Events January 1 January – Treaty of Rome establishing European Economic Community comes into force. 10 January – Konrad Adenauer and Robert Schuman received honorary doctorates from the Catholic University of Leuven. February 3 February – Treaty creating Benelux Economic Union signed, to come into force 1 November 1960, providing for free movement of workers, capital, services, and goods between Belgium, the Netherlands, and Luxembourg. March 11 March – Prince Albert takes his seat in the Senate. 12 March – Fud Leclerc comes sixth in the Eurovision Song Contest, singing "Ma petite chatte". 18 March – Atomium completed. April 4 April – Tourist information office opens on the Place de Brouckère, Brussels. 12 April – Bokrijk open-air museum opens. 17 April – King Baudouin opens Expo 58, the first major World's Fair since the Second World War. John Carl Studder of El Paso, Texas, had queued for 48 hours to be the first visitor admitted. May 18 May Demonstration of about 200,000 marches through Brussels to protest the Socialist government's education policy. A Douglas DC-7 on a Sabena flight to Léopoldville crashes in Casablanca, with 65 fatalities and 4 survivors. 28 May – Real Madrid wins the European Cup Final against A.C. Milan in the Heysel Stadium, Brussels June 1 June – General election held: Christian Democrats become the largest group in parliament. 15 June Tony Brooks wins the 19th Belgian Grand Prix at Spa-Francorchamps. Brussels Film Festival opens, with Georges Simenon chairing the jury. 22 June – Olivier Gendebien, partnered with Phil Hill in the Scuderia Ferrari team, comes first in the 24 Hours of Le Mans. 26 June 45th Tour de France starts in Brussels. Gaston Eyskens (Christian Social Party) replaces Achille Van Acker (Socialist Party) as Prime Minister. July 20–23 July – World Archery Championships held in Brussels. September 9 September – USS Skate (SSN-578) ceremonially welcomed in Zeebrugge after its Arctic mission. 25 September – Belgian government intervenes to reduce the price of Belgian coal, with 7,855,000 tonnes stockpiled but uncompetitively expensive on international markets. October 4 October – Sabena breaks Brussels–Paris air speed record with an S58 helicopter. 10 October – Patrice Lumumba founds Mouvement National Congolais. 12 October – Municipal elections; Christian Social Party makes gains. 19 October –