How do you get there?
 

Getting to Liège by car, from :

Brussels : E40
Namur : E42
Aachen : E40
Maastricht : E25
Antwerp : E313

Getting to Liège by train
Take the (high speed) train to the Gare Guillemins which is the central railway station in Liège.
Link : https://www.belgiantrain.be/en/ - https://www.transilien.com/en
There is a regular bus service to the Palais des Congrès de Liège via bus routes 17 or 138.
TEC link : http://www.infotec.be
The Palais des Congrès de Liège is 10-minute walk from the station, via the « Belle Liégeoise » footbridge.
 
Getting to Liège by plane :
The national airport is at Zaventem, near Brussels. There is a frequent train service between Zaventem and Liège.
Link : http://www.brusselsairport.be/en/
Liège airport is at Bierset, on the E42 motorway. 
Link : http://www.liegeairport.com/home