Thanks to Eric for the following information from MCD:
“Following months of speculation, we can now confirm that U2 will play a second show at Slane Castle on Saturday, September 1st. The show marks the twentieth anniversary of U2’s only previous appearance at Slane when they supported Thin Lizzy. Tickets are limited to four per person and are on sale at 1.00 pm today (Monday July 9th). Tickets will be available online from . Support artists for the U2 concert on the 1st September include Moby, Foo Fighters, Nelly Furtado and Dara.”

sorry. sold out in 94 minutes.