I've just registered at the event.
luckily there are no underground transports works ongoing so I can reach as last year Europa Fira stop: just take your nearest underground/ground line and go to Plaza Espana; there you have to follow the signal for the pink train line. The first train that go to Europa Fira is yours (almost all the trains departing from here on the pink line stop there).
Outside the Europa Fira stop there is the Metro-VMWorld-Metro shuttle stop. no need to obliterate, just catch the first that stop there.