THURSDAY Prime Minister Costas Karamanlis to chair a meeting of his party’s parliamentary group. In the afternoon he will leave for Vienna to attend the fourth EU-Latin America/Caribbean summit. To Saturday. Culture Minister Giorgos Voulgarakis visits Istanbul to attend the 15th International Theater Festival of Istanbul. Agriculture Minister Evangelos Bassiakos to meet with Japanese Deputy Minister of Agriculture, Forestry and Fisheries Issui Miura. Deputy Sports Minister Giorgos Orfanos to meet with the organizing committee of the European Cup Bruno Zauli in Thessaloniki. Judicial officials stage a two-hour work stoppage today and tomorrow between 1-3 p.m., demanding more staff, better working conditions and higher pay. The Center for Democracy and Reconciliation in Southeastern Europe, in cooperation with the Aristotle University of Thessaloniki, holds a conference on «The Enlargement of Youth in the Enlargement of the European Union,» at 5 p.m. at the university’s premises. Tel. 2310.960.820-1 Schoolteacher federation (OLME) holds a 24-hour strike over financial and institutional demands. FRIDAY The Committee Against Violence (DEAV) holds a conference on «Violence in Stadiums and the Role of the Committee (DEAV),» at 10 a.m. at the Metropolitan Hotel. Deputy Sports Minister Giorgos Orfanos will make the opening speech. The Christian Archeological Society holds a symposium on «Byzantine and Post-Byzantine Archaeology and Art,» starting at 9.30 a.m. at the Byzantine and Christian Museum. To Sunday. Tel. 210.721.1027. The 29th Book Fair begins at the Dionyssiou Areopagitou Street. Runs through May 28. General Secretariat for Research and Technology holds a conference on «Investing in a Europe of Knowledge and Innovation,» at 10 a.m. at the National Research Foundation. Development Minister Dimitris Sioufas is expected to attend. Tel. 210.745.8000 or log on to www.gsrt.gr. State hospital employees stage a three-hour work stoppage from noon to 3 p.m. over financial and institutional demands.