Monday Prime Minister Costas Karamanlis visits London. To Wednesday. Thessaloniki’s Aristotle University is hosting a conference on «Participatory Journalism, Blogs and New Media,» at the Teloglion Foundation of Art. For further information, visit www.jour.auth.gr. The conference will be repeated tomorrow at the University of Athens. Tuesday The General Confederation of Greek Labor (GSEE) and the civil servants’ union (ADEDY) stage a 24-hour strike protesting rising prices and reforms. At 11 a.m. there will be a protest rally at the Pedion tou Areos park. The Athens Journalists’ Union (ESIEA) joins the 24-hour strike called by GSEE. Wednesday Stores in Piraeus will remain closed today as workers strike over institutional and social security demands. The Center of European Constitutional Law holds a conference on «The Rights of the Disabled» at 6 p.m. at the premises of the National Bank of Greece (82-84 Aeolou). For further details, call 210.362.3089 or log on to www.cecl.gr. Thursday Prime Minister Costas Karamanlis visits Beijing. To Saturday. Friday United Nations Day. The 8th International Obesity Congress begins at 2 p.m. at the the Porto Rio Hotel in Patras. The conference is hosted by the Hellenic Association for the Study of Obesity, Metabolism and Eating Disorders and will run through Saturday. For further information, log on to www.corfuxenos.gr/conference/obesity-conference.htm. The Greek Ecological Organization Network (PANDOIKO) is hosting a congress on the natural environment and public administration. The congress starts at 5 p.m. in the amphitheater of the Technical College of Serres. European Environment Commissioner Stavros Dimas and Athens Mayor Nikitas Kaklamanis are to speak. To Sunday. For further information, call 694.426.3636. Sunday Prime Minister Costas Karamanlis visits Doha, Qatar. To Monday. Clocks go back one hour at 4 a.m. on Sunday as daylight saving time ends.