Most of participants will be flying to either Paris or Lyon.
Reaching Goutelas from Paris:
take a TGV to Saint-Étienne (Saint-Étienne-Châteaucreux train station) then a train to Boën
departing train station in Paris: Paris - Gare de Lyon.
reservations are necessary for TGVs
check the SNCF website to book your ticket and for time tables.
take a bus in the airport to one of Lyon’s train stations (Perrache or Part-Dieu depending on the time when you can catch a train to Saint-Étienne)
check the bus timetable (unfortunately in French).
take a train to Saint-Étienne-Châteaucreux station and then to Boën.
check the SNCF website to book your ticket and for time tables.