I've noticed that! I gave them a cup for refill and they gave me the cup from another person who was ordering with me! I was always asking for a new cup just to escape using my old dirty one, but looks like it was a mistake.
I ended up with some sort of cold, my flight went terrible cuz of that, I didn't take a test and I'm working from home now. My friend developed the same symptoms at the same time! We still think that it was maybe cuz of Razzmatazz, but maybe cups, who knows. I've seen dirty cups in Razzmatazz as well, just washed by pure water.
However, if I'm doing Primavera next year, I'll do just Barcelona. Two weeks is def too long for someone who is hitting 30 soon.
It was a great time, maybe I'll write a review about the artists I've seen.