By plane:
Pisa International Airport (PSA) : it is possible to take the shuttle PisaMover bus shuttle (5€) or book a taxi (~15€). Alternatively the conference venue is approximately a 40-minutes walk away.
Firenze Airport (FLR) : there is a train connection between Firenze and Pisa; travel time is around 1 hour, with departures every 20 minutes.
By train:
Train to/from Firenze, approximately 1 hour.
Train to/from Roma or Milano, approximately 3 hours.