If they could tell you how many spaces were left in each A La Ciutat venue in real time, like a car park does, but in the app / online, now that would be useful
I'm thinking there might be some clues in the last part of the email.
"Can't do without you" - maybe Caribou to headline.
"We aren't afraid to repeat ourselves" - Weekend 2 acts filling in on weekend 1, or acts playing multiple days.