THURSDAY Prime Minister Costas Karamanlis visits London. He is expected to meet with his British counterpart Tony Blair, while in the afternoon he will address a conference on «The Perspectives of Greece after the Olympic Games,» hosted by the City University. Labor Ministry holds a conference on «Entrepreneurship, Education and Employment,» at 9 a.m. at the University of Athens, 30 Panepistimiou. Education Minister Marietta Giannakou and Labor Minister Panos Panayiotopoulos to speak. Tel. 210.527.1400. Deputy Culture Minister Petros Tatoulis visits Evia prefecture. Tomorrow he is to visit Delphi to speak at the international meeting «The Year of Periklis,» hosted by the European Cultural Center of Delphi. Transport Minister Michalis Liapis to visit Eleftherios Venizelos International Airport to be briefed on preparations for the summer traffic onslaught. US Deputy Undersecretary of Defense for Industrial Policy Suzanne Patrick visits Athens. Thirteenth Journalism conference on «Mass Media: Modern Reality in Greece and Europe,» to convene in Samothrace. To Sunday. Tel. 25510.368.23. A Greek-Turkish business conference opens at the Athenaeum Inter-Continental Hotel in Athens. Deputy Foreign Minister Evripidis Stylianidis and Tourism Minister Dimitris Avramopoulos to speak. To tomorrow. Tel. 210.322.2093-4. Transport Minister Michalis Liapis to visit Thessaloniki, where transport ministers of Southeastern Europe will sign a cooperation memorandum for the development of the single broadband market. FRIDAY Presidents of country’s bar associations convene at the Macedonia Palace Hotel in Thessaloniki to discuss judicial issues. Justice Minister Anastassis Papaligouras expected to attend. ellenic Center for European Studies (EKEM) holds a conference on «60 Years of the United Nations: Challenges and Perspectives,» to be held at 10 a.m. at the Foreign Ministry. Tel. 210.321.5549 or log on to www.ekem.gr. Development Minister Dimitris Sioufas to inaugurate a new hydroelectric station in Aigion. Second International Biotechnology Forum takes place at the Dais cultural center. To Sunday. Tel. 210.800.4910. SUNDAY International Exergy, Energy and Environment Symposium (IEEES2) takes place at the Kipriotis Hotel on Kos. To Thursday. Tel. 2310.995.958. Prime Minister Costas Karamanlis and his Turkish counterpart Recep Tayyip Erdogan inaugurate the natural gas pipeline linking Greece with Turkey in Evros.