Lille is a city located at the crossroads of Paris, Brussels and London. It can be reached by train, plane or car.

By plane:
The worldwide connected Paris-Roissy-Charles De Gaule (CDG) Airport is, by TGV-high speed train, less than one hour away from the railway station Lille-Europe. The Lille Grand-Palais conference center is very close to the railway station. It may be reached by foot.

http://www.aeroportsdeparis.fr/ADP/en-GB/Passagers/Home/
http://www.easycdg.com/pages/indexpag.html

Coming from Paris-CDG Airport by car is longer (~ 2h) and emits much more (x 10) greenhouse gas emissions than by train. Details and examples here.
Lille-Lesquin airport is also available for interior flights.

http://www.lille.aeroport.fr/

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By train: The two train stations in Lille, Lille-Europe and Lille-Flandres, are one hour away from Paris-Gare du Nord railway station by TGV-high speed train.

http://www.voyages-sncf.com/

And from neighbouring European countries, Thalys and Eurostar high speed trains are available as well.
http://thalys.voyages-sncf.com/
www.eurostar.com

By car: Lille is located at the intersection of the European highways E42 (Dunkerque, France – Aschaffenburg, Germany) and the E17 (Antwerp, Belgium – Beaune, France). Participants who come by car and rely on GPS-navigation systems: please make sure to enter Lille in France. There is also a village named Lille, located in Belgium, 160 km away...

In order to reduce your greenhouse gas emissions, more important by plane than by train, you may find here some tools which will propose several transport types from your place to Lille. Our own list of examples is here.