From the Luxembourg airport take Bus 16 (Eurobus) to "Gare Centrale" station (26 min. approx.). The bus comes at minutes 10, 25, 40 & 55 of every hour between 7H & 19H.
Direct trains to Nancy depart every 30-60 minutes (approx. 1H30, 22 EUROS). For timetable and ticket reservation check, see SNCF site.
From any airport go to "Gare de l'Est" station: you can find a transportation guide at this link: RATP. At "Gare de l'Est" station, direct trains to Nancy depart every hour in the afternoon (approx. 2H50, 40 EUROS). For timetable and ticket reservation check, see SNCF site.
The conference takes place in Amphithéâtre 8 on the campus of the Faculté des Sciences of the Université Henri Poincaré, located in Vandoeuvre. To go to the campus of the Faculté des Sciences from downtown, for instance from the station, take the T1 tramway at the "Nancy Gare" stop, direction "Vandoeuvre CHU" (departures every 6-7 minutes). Then, you just have to get out at the "Callot" stop and to walk for 300 meters. (First follow the "Lycée Jacques Callot" direction): see the green points on the campus map.