The main Dutch airport, Schiphol, is a hub. Trains to the city center of Utrecht depart every 15 minutes from Schiphol Airport. Travelling to and within Utrecht is therefore extremely easy.
Both the conference location on the first day as well as the main hotels are near Utrecht Central Station. Utrecht has an extensive bus system and busses to and from Utrecht Science Park run regularly. You can reach Utrecht Science Park by bus from Utrecht Central station (lines 28 and 12). Plan your trip via 9292 for all regional public transportation. Exit the bus at the bus stop: Padualaan.