MONDAY The University of Athens and the Fulbright Foundation host a conference on «Innovative Views on Youth Entrepreneurship» at 11 a.m. For details, log on to http://career-office.uoa.gr. The Technical Chamber of Greece hosts a workshop titled «Toward a Sustainable Built Environment and a Living Cultural Heritage,» at 9 a.m. at the National Hellenic Research Foundation. Tel. 210.727.3700 or log on to www.tee.gr. TUESDAY The American-Hellenic Chamber of Commerce hosts the Healthworld 2007 conference at 9 a.m. at the Ledra Marriott Hotel in Athens. Tel. 210.699.3559 or log on to www.amcham.gr. WEDNESDAY The Athens Chamber of Commerce and Industry and the UNIDO Investment Promotion Unit in Athens will host a conference titled «Potential for Business Cooperation with Tunisia,» at 9 a.m., 7 Academias. Tel. 210.338.2256 or log on to www.acci.gr. The Athens Chamber of Commerce and Industry hosts a conference on «Natural Gas in Greece,» at 5.30 p.m. at its premises. Tel. 210.338.2256 or log on to www.acci.gr. THURSDAY President of the Republic Karolos Papoulias attends the annual general meeting of the Federation of Greek Industries at 7.30 p.m. at the Athens Concert Hall. Athens University hosts the 11th international conference of the Geological Society of Greece, titled «Athens 2007: Geoenvironment: Past, Present and Future,» at 9 a.m. at the university campus in Zografou. To Saturday. Tel. 210.727.4164 or log on to http://conferences.geol.uoa.gr. The 16th Panhellenic Commercial Fair «Thrace 2007,» opens at the International Exhibition Center in Komotini and will run through Sunday. Tel. 2310.291.558 or log on to www.tif.gr. FRIDAY The Hellenic Association of Young Entrepreneurs (OESYNE) will host a conference titled «Greece: Hub of Innovation and Entrepreneurial Cooperation for the Eurasian Territory,» at the NJV Athens Plaza Hotel. To Saturday. For details, log on to www.yes.be. SATURDAY The Hellenic Society for Systemic Studies (HSSS), hosts its third national conference, titled «New Market and New Technology: Systemic Structures, Broadband and Social Dynamics.» To Monday. Tel. 210.414.2145 or log on to www.hsss.gr.