U2 will have the first crack at it in a couple of months so if you want to attend, bring your wallet:
"When Will u2 be at the sphere?
After a four-year absence, U2 will take the stage for U2:UV Achtung Baby Live at the Sphere as the first act to perform at the new 17,500-seat venue on September 29. Additional dates include September 30, October 5, October 7, and October 8."