I was certainly aware of the Seville expo. I was living in England when it happened, but had no intention of going because the lines were known to be so brutally long.
then, like the rest of the world, I forgot about it ... and I've even been through there a couple times since, without even thinking about it.
http://www.cnn.com/2015/02/25/travel/seville-expo-cnngo/index.html