"The show IS taking place on May 19, but U2 and Metallica won't be there. However, Green Day and Rancid will be, among other bands. My friend is on the guest list and got 20 tickets, and unfortunetly, I don't think tickets are going to be sold." I think it's far more important for bands like Green Day and Rancid to be there, than bands like U2 and Metallica who would just cheapen the whole affair.