Travel to Thessaloniki
Thessaloniki airport (SKG) is close to the College venue and the city center. College: 15 minutes by taxi. Center: 30 minutes by taxi or 45 minutes by bus (no. 78, runs 24 hours, normal fare €0.80). The airport has direct flights to pretty much all major European cities (85 airports in 26 countries), especially in northern Europe.
A quick check on www.expedia.com [.de;.co.uk; etc.], www.skyscanner.com, www.tripadvisor.com/CheapFlights or a similar site will give you an impression how you can get here (but they might exclude low cost airlines like germanwings, Ryanair, Easyjet, Sky Express, JetAirfly). Live information about the airport and flights at Flightstats. The best thing probably still is to ask a human travel agent who knows their job ...
The following airlines fly to and from Thessaloniki:
More than enough details about flights to and from Thessaloniki on http://www.theairdb.com/airport/SKG.html
A guide to the airport and travel to-from there: http://www.thessaloniki.travel/index.php/en/travel/getting-to