Assuming you have travelled by plane...
Francisco Sá Carneiro airport is located just outside town.
When you leave the airport, you can rent a car or take one of many transportations to the city.
The two easiest ways of getting to the city is taking a taxi or by metro.
If you choose to catch the metro, the airport line takes you directly to the main station "Trindade", just in the city center. From there you can switch to the line that best suit your needs.
If you're going straight to the congress venue, switch to the line D at "Trindade" and get off at the station "São Bento". From there you have to walk down Mouzinho da Silveira street. When you get to the end of the street you'll find the Infante D. Henrique Square. You have to turn right to the street Rua Nova da Alfândega and in a few moments you'll arrive at the congress venue.
If you're going to one of our hotels suggestions, check the addresses at the "Accomodation" menu.
You can easily get your directions from and to the airport here.
Check the metro maps and lines here.