Delegates may travel by car, train or bus to the City of Katerini, Greece.
The closest airport is THESSALONIKI AIRPORT that arrives to Thessaloniki train station and runs very often (around 50 minutes and cost of ticket around one euro)

TRAINS TO AND FROM KATERINI (FROM THESSALONIKI) (duration 40-50 minutes) -from train station 

https://www.hellenictrain.gr/en

BUSES TO AND FROM KATERINI (FROM THESSALONIKI) (duration 50 minutes) – from bus station 

https://ktelpierias.gr/en/thessaloniki-2/