Prime Minister Costas Karamanlis attends the European Council Assembly in Strasbourg. Finance Minister Giorgos Alogoskoufis meets with the board of Emporiki Bank. Synaspismos Left Coalition Party President Alekos Alavanos meets with Argentinean Ambassador Jorge Alejandro Mastropietro. Sports Minister Giorgos Orfanos chairs the first meeting of the newly formed committee for Sports Tourism and Francophony. Deputy Labor Minister Gerasimos Giakoumatos begins a four-day visit to Grevena, Kastoria, Florina and Kilkis prefectures. To Sunday. The Greek Society for the Protection of the Environment and the Cultural Heritage holds a conference on «Environmental Archaeology: Research and Digital Reconstruction of the Ancient Environment of Greece,» at 9 a.m. at its premises in Plaka. Tel. 210.322.5245. The Athens Stock Exchange hosts a conference on stock options, at 1 p.m. at the old Athens stock exchange at 10 Sophocleous. University professors stage a 24-hour strike opposing the amendment of Article 16 of the Constitution. The Federation of Secondary School Teachers (OLME) calls a three-hour work stoppage to participate in the protest at Athens University. Intracom shareholders hold an extraordinary general meeting at 4 p.m. at the offices of the Investment Bank of Greece. The fifth international congress on lung cancer begins at noon at the University of Patras. To Saturday. Tel. 2610.993.999 or log on to www.confer.upatras.gr.