Athens Digital Week, featuring a series of events showcasing new digital technologies, begins at the Technopolis complex in Gazi, hosted by the City of Athens. Through Sunday. For further details, log on to www.athensdigitalweek.gr.

The Constantine Karamanlis Institute for Democracy is hosting a conference on the “US Presidential Elections 2008” at 6 p.m. at the Hilton Hotel. Paul Glastris, editor in chief of the Washington Monthly and former speechwriter to President Bill Clinton will speak. For further details, call 210.725.7495.

The US Embassy in Athens and its consular section, the US Consulate General in Thessaloniki and all US government offices in Greece will remain closed today in observance of Columbus Day, a US national holiday.

University of Thessaloniki is hosting a lecture on “Water in the Age of World Climate Change,” by Colorado State University Professor Evan Vlachos. At 12.30 p.m. at the university campus.

Aristidis Daskalopoulos Foundation is hosting a seminar on “Basic Principles of Hygiene and Food Safety,” at the Hellenic Cosmos Cultural Center (254 Pireos, Tavros). Attendance is free. For further information, call 210.724.7300 or log on to www.iad.gr.

University of Ioannina is hosting a two-day international symposium on “Information & Communication Technologies in the Cultural Heritage,” to be held at its premises. For information, call 26510.95655 or log on to ww.uoi.gr.

Leaderexpo hosts the fourth “Watertec 2008” exhibition taking place at the Helexpo Palace in Maroussi. Parallel events include the first international exhibition on environmental technologies EnviCity 2008 and the third international conference Aqua 2008 on “Water Science and Technology with Emphasis on Water and Climate” hosted by Athens University. To Sunday. For further information, call 210.614.1164 or log on to www.leaderexpo.gr.

The second Swedish-Greek Life Science Research Conference begins at the National Hellenic Research Foundation in Athens. To tomorrow. For further details, call 210.727.3768 or log on to www.eie.gr.

Aristotle University in Thessaloniki is hosting a conference on “Cultural Diversity in the Greek Junior High School” starting at 4.30 p.m. on its campus. For further information, log on to www.auth.gr.