The Thessaloniki International Trade Fair, held at the town's Exhibition Centre, is one of the biggest in the Mediterranean. Drawing participants from most of the countries in the world, sees people promoting everything from industrial equipment to Christmas decorations via construction, transport, clothes and food. It also draws around half a million business folk from the city every year - which means that, if you're planning to visit Thessaloniki as a tourist, this is definitely not the best time to go.