Beginning September 5th at noon, holders of American Express cards can register online for the chance to win a pair of tickets from out of 6,000 free ones that will be given away. The tickets are for evening performances on September 15th.The 15 shows for which the tickets will be available include Wicked, Mamma Mia!, Chicago, Martin Short: Fame Becomes Me, The Phantom of the Opera, The Producers, Heartbreak House, Rent, The 25th Annual Putnam County Spelling Bee, The Wedding Singer, Hairspray, Avenue Q, The Drowsy Chaperone, Spamalot and The History Boys.Visit this link for more information and to register (beginning Sept. 5th).