Please be sure to check whether you need a visa to enter Switzerland.
If you take the plane the most convenient way is to arrive either at Geneva or at Zuerich (see map). From both airports there are direct trains to Lausanne. It takes about 45 minutes from Geneva, and roughly 2h30 from Zuerich. Trains run about every half-hour.
If you are planning to visit the area of Lausanne it might help to check out the following dynamic map. It is fairly convenient to use public transportation (either trams and buses, or the train).
The conference takes place on the EPFL campus in the SG building (upper left corner of this map). The black lines that you can see crossing the top of the map is the TSOL, the tram which runs from the center of Lausanne to EPFL. From Lausanne take the TSOL in direction Renens and exit at the station EPFL. From EPFL take the TSOL in direction Flon. The ride takes about 13 minutes. The tram runs quite frequently.
If you are planning to visit to Lausanne or other parts of Switzerland you might find it helpful to check out the Official Tourist Site of Lausanne. If you want to move around within Switzerland it is convenient to take the train.