In order to reach the venue from the airport you need to either get a taxi or catch the public transportation bus No. 78 and get at the stop titled "I.K.A" and then walk approx. 5-10 minutes. The cost of the bus is 0.80-1.00 euro (depending on the point of issue) while for the taxi approx. 20 euro. Please notice that the nightly bus service No. 78N runs from 23:30 - 05:30 using a different route than No. 78 and the closest stop to the venue is the stop titled "Zografou" and then walk approx. 10-15 minutes.
Public transportation bus tickets can be purchased from numerous small markets throughout the city as well as from within the buses using the automated vendors (~0.10 euro more expensive than pre-paid) that accept only coins
More information on the public transportation bus of Thessaloniki is available at http://oasth.gr/en/
For your convenience it is recommended to use a taxi from the airport to the venue.