Mikey: Rap Radar was in attendance as Jay-Z held a press conference for his 9/11 Benefit Concert at MSG. Tickets for the “Answer the Call” concert will be $50 and go on sale September 8th at 9 A.M. for Citibank cardholders (12:00 P.M. for general public). All proceeds will be donated to the New York Police and Fire Widows’ and Children’s charity.