TOMORROW is shaping up to be a busy night around town. Steve Nash has lined up fellow NBA greats Jason Kidd and Tony Parker, plus soccer stars Thierry Henry and Javier Zanetti, to play soccer for charity at hisShowdown in Chinatown, with an after-party at Hudson Terrace . . . Liv Tyler‘srockin’ mom, Bebe Buell, is kicking off her new single, “Air Kisses for the Masses,” at the Maritime Hotel’s Hiro Ballroom . . . Hampton Sheet publisher Joan Jedell is taking over two penthouses at the Hotel AKA on West 58th Street for her Spring Into Summer party.