THURSDAY Deputy Defense Minister Vassilis Michaloliakos visits Greek Defense Systems unit (EAS) in Kymi. President Karolos Papoulias to speak at an event hosted by the Officers’ Club in Thessaloniki. Anti-racism Initiative stages a protest rally at 10 a.m. at Tsimiski and Aristotelous streets, Thessaloniki, demanding the abolition of student parades. Trolley-bus drivers stage work stoppage from noon to 4 p.m. Prime Minister Costas Karamanlis to attend informal meeting of EU leaders in Hampton Court Palace, UK. To tomorrow. FRIDAY Deputy Foreign Minister Evripidis Stylianidis attendsmeeting of foreign ministers of the Black Sea Economic Cooperation Organization in Moldova. To Saturday. President Karolos Papoulias attends student parade at 11 a.m. on Megalou Alexandrou Ave in Thessaloniki. The Hellenic Association for the Study of Obesity starts an international obesity congress at the Corfu Palace Hotel, Corfu. To Saturday. For details, log on to www.corfuxenos.gr. University of the Aegean starts an international conference on «The Impact of Natural Catastrophes,» at 9 a.m. at the Mediterranean Hotel on Rhodes. Seismologist Gerasimos Papadopoulos to speak. To Sunday. Tel. 22410.993.85-6. Public holiday commemorating October 28, 1940, when Greece entered World War II on the side of the Allies. nternational symposium on «Water and Wastewater Technologies in Ancient Civilizations» starts at the Atlantis Hotel in Iraklion, Crete. To Sunday. Tel. 2810.245.851. First congress of the European Left opens at the Peace and Friendship Stadium. Synaspismos Left Coalition President Alekos Alavanos to speak. To Sunday. SUNDAY Clocks go back one hour at 4 a.m. to 3 a.m. – as summer time ends.