Monday – Hellenic American Union holds a workshop on «Network Firewall Security.» At the HAU conference hall, to September 25. For further information, tel 210.368.0907. – Labor Minister Dimitris Reppas chairs National Employment Committee meeting. Talks will focus on the National Employment Action Plan (ESDA) for 2003-2006. – The Panhellenic Federation of Grocers and Mini Market Owners hold a press conference on current developments in the retail market after the decision of supermarket owners to freeze prices, and its impact on consumers. Tuesday – Hellenic American Union holds a three-day seminar in Larissa and Kastoria on «Management Overview for Managers.» To Friday. For further info, tel 210.368.0006. Thursday – Hellas Jet board holds press conference at Athenaeum Intercontinental Hotel. Friday – International congress on Expo 2008 titled «Motherland, Knowing the Earth, Agriculture and Nutrition,» will be held at the Vellidis conference hall in Thessaloniki. The conference is organized by the Thrace-Macedonia Ministry. To Saturday. Saturday – The Hellenic Association of Travel & Tourist Agencies (HATTA) in cooperation with Greek National Tourism Organization (GNTO) celebrate World Tourism Day at Zappeion Hall. Entrance is free. Info on tel 210.922.3522.