The air date for Tim McGraw's NBC-TV special has been changed from its originally-announced date of April 5. Tim McGraw: Reflected, his third network TV special, will now air April 7. ... In other news, McGraw will headline an April 8 concert in Tunica, Miss., to raise money for the Brett Favre Forward Foundation, a nonprofit organization that provides aid to disadvantaged and disabled children. Tickets are sold out for the show at the Horseshoe Casino & Hotel.