The simplest is to come by the metro from Lille to "4 Cantons" (Line 1-yellow), and get off at "Cité scientifique" station. The IUT A building is only 3-minute walk from the station. The overall time is about 25-30 minutes from the city center of Lille to the "Cité scientifique" station.
Here is a map of the main workshop building.
By train (from Paris, Bruxelles, London,...): The two main stations in Lille, namely "Lille-Flandres" and "Lille-Europe", are only a 5-7 minute walk from each other. Furthermore, a connection by the metro is also possible (using Line 2-red), so that you can straightforwardly use the metro from any Lille station to the conference.
By plane: The Lille airport is located in Lesquin (close to Lille and the university campus). The airport is only 20 minute far from the university by car.
Numerous flights are available each day between Lille and French cities such as Bordeaux, Nantes, Toulouse, Strasbourg, Lyon, Marseille,... Connections with foreign countries (Geneva, Barcelona, Pelermo,...) are also possible.