We will organize bus transportation from Sion to Arolla. The closest airport to Sion is in Geneva, which is about 160 km from Sion (approximately 2 hours by train). It is also possible to fly into Zurich and then to travel by train to Sion (a bit less than 3 hours by train).
Arriving by train and bus: Take a train in the direction of Lausanne, where you may need to change to catch a train to Sion (Lausanne-Sion=100 km). There are some offers from the Swiss Federal Railways. The conference bus will pick up passengers at the train station in Sion. If you are not taking the conference bus from Sion, upon exiting from the train station in Sion, turn left to find the stops of the yellow "La Poste" buses. When you arrive in Arolla, ask the driver to let you off at the Hôtel Mont-Collon. Train and yellow "La Poste" bus schedules are available on the web site of the Swiss Federal Railways.
Arriving by car: Take the highway to Sion, which is approximately 100 km east of Lausanne. Exit from the highway at "Sion-Est" and follow the signs for "Val d'Hérens". The first village you come to will be Vex, where you should follow the signs for "Evolène-Arolla". You will then go through Euseigne, Evolène and Les Haudères before arriving in Arolla, about 40 km from Sion. The Hôtel Mont-Collon is at the entrance to the village of Arolla. The web site www.viamichelin.com can be very valuable to find your itinerary.