MONDAY The Center for Renewable Energy Sources (CRES) is organizing an event on «Education and Training in Renewable Energy Sources and Energy Saving,» starting at 5 p.m. at Zappeion Hall. The event forms part of the Science and Technology Festival 2008 held by the Development Ministry’s General Secretariat of Research and Technology and will run to Wednesday. For more information, visit www.cres.gr. The National Research Foundation’s Institute of Modern Greek Studies is hosting a two-day event to celebrate the foundation’s 50th anniversary. At 7 p.m. today a lecture will render an account of the institute’s work of the last 50 years, while tomorrow four history professors will discuss the significance of studying modern Greek society and education. For further information, call 210.727.3554. World AIDS Day is observed today with several events across the country, including an awareness festival in Athens by the Praksis nongovernmental organization. For more information, call 210.520.5200 or visit www.praksis.gr. TUESDAY The Hellenic Foreign Trade Board and the Federation of Industries of Northern Greece are organizing a conference in Thessaloniki on «Quality, Standards, Certification and Market Monitoring in the Construction Materials Sector.» For more information, call 2310.539817 or visit www.sbbe.gr. Employees at the Competition Commission stage a three-hour work stoppage in protest at a delay by the Development Ministry on any progress in the sector’s key demands. WEDNESDAY The British Graduates Society is hosting a lecture by former British Ambassador to Greece Sir Michael Llewellyn-Smith, at the Athens Concert Hall at 7 p.m. on «The Politician and the Historian: Eleftherios Venizelos and Thucydides.» Entrance is free. Complementary tickets can be obtained at the Athens Concert Hall’s box office from 6 p.m. on the night. Employees at the Competition Commission start a three-day strike in protest at alleged delays by the Development Ministry on any progress in the sector’s key demands. The Prefectural Authority of Samos, in the eastern Aegean, will remain closed today in protest at the high number of illegal immigrants who arrive day after day on the island. The immigrant detention center on Samos will operate on skeleton staff today. FRIDAY «Building Green Expo,» the international professionals’ exhibition on bioclimatic construction and energy-saving technologies in buildings, starts today and concludes on Monday at the Expo Athens center at Anthoussa, eastern Attica. The exhibition is being held under the auspices of the Environment and Public Works Ministry. For further information, visit www.buildinggreen.gr.