@gradoca, that’s great to know! I’m very happy that you enjoyed your stay. From your list I liked Dry Cleaning and Helado Negro, the others I didn’t saw (DIIV I saw a few years ago and the frontman was a bit… off). Others I enjoyed were Black Midi, Arnaldo Antunes, Jehnny Beth, and Khrugbaian (there is a great spot behind the Cupra stage with park benches, fantastic concert).
About the headliners, Nick Cave and Tame Impala I thought totally delivered, Beck I agree with you. He seemed a bit like going through the motions, towards the end it was better, though. Gorillaz I actually didn’t saw, some friends of mine went to Barcelona and one said it was terrible. By comparison, maybe the Porto show was actually better. The thing about some members not traveling is very irritating indeed. If the organizers can’t book all of the members for both cities, it’s better not to schedule them in Porto. But Gorillaz is kind of a rarity to get, so I would understand, if it was properly announced.
The whole official communication of Primavera is a weak point in my opinion. I don’t use social media and the official site is very poorly kept, zero updates and the information is very scarce.