This time it's the RSA Europe conference 2004, in Barcelona.
Very nice conference! RSA Conference is heavily breaking away from it's roots of encryption-only event and becoming an all-in-one massive security conference. With over 1000 attendees, it's probably one of the biggest security events anywhere.
One major gripe though; I tried entering Bruce Schneier's presentation, and there were way too little seats. Probably a hundred people was standing in the room and many people didn't fit in at all. Many were queueing to see at least something. It felt almost like DEF CON...