As much I don't like festivals in my country (Poland), I must admit - AlterArt managed to deal with headliner crisis perfectly. Sam Smith cancelled - 48/72h later - bang - 30 Seconds to Marsa are coming. And for a gig that's happening this weekend.
Hope you'll get a splendid replacement, I only regret it didn't happen earlier. Stromae was one of the main reasons no one from my crew wanted to travel this year