The Brainstorming will take place at E.T.S. Ingeniería Informática (it's a big white building), located at Campus of "Reina Mercedes". Bus line 34 is the best line number that we can advise, as it goes from the city center directly to the conference site (it stops exactly in front of the building).
Many buses announce each stop through displays and loudspeakers. The bus stop is named "Avenida Reina Mercedes. Escuela Superior de Ingeniería Informática."
You can find more information about buses at www.tussam.es (in Spanish!) and maps of Seville at:
http://callejero.paginasamarillas.es/home.asp
or
http://www.mappy.com.
Have a nice trip and do not hesitate to ask any extra information you need!