If you are planning to use public transportation in Barcelona, you can purchase (at any underground station in the city) a T-10 ("teh - dee-es") card for 6.90 Euro, which entitles any user (it is  multipersonal) to ten trips in the Barcelona metro or city buses.

You have info on the city of Barcelona at:  http://www.bcn.cat/english/ihome.htm.  From this web address, if you select "BCN map" and write the addresses you will get a map of the Residence area and the Conference venue area.