Hotel and Travel
Usually, the most affordable flights go to Amsterdam Schiphol airport, from where it is a 30-60 minute train ride to Rotterdam. You can best plan this train ride through the Dutch national train services (NS). Tickets can be bought directly at the airport. In some cases, affordable flights land on Rotterdam The Hague airport directly, from where you will be able to take public transport to the city center (<30 minutes).
The Thalys and many other international train services stop at Rotterdam Central Station, which is located right at the city center. From there, you can easily access the symposium venue by public transport or even by foot.
Rotterdam has a range of affordable and more luxury hotels. Any hotel located in the city center (near subway stations Centraal Station, Stadhuis, Leuvehaven, Wilhelminaplein, Beurs, Dijkzicht, Coolhaven or Eendrachtsplein) should be close to the venue.