If you’re staying in accommodation that pays the overnight tourist tax, you can freely use public transport (bus, train, metro) during your whole stay (maximum 15 days) in Lausanne and its surroundings with your Lausanne Transport Card. But that’s not all! You benefit from discounts and advantages from many museums, shops and other leisure activity providers.
To reach the conference venue from the Lausanne train station ("Lausanne gare"), take the metro line M2 in the direction Croisettes, and get off in Lausanne-Flon (one stop). There, change to metro line M1 direction Renens, and get off at EPFL.
Detailed map of the Lausanne public transportation system (PDF):