NEW YORK (AP) — Members of the Grateful Dead and John Mayer are giving away 10,000 free tickets to a concert next month. The two musical acts say 5,000 fans will have a chance to win two tickets each to their Nov. 7 show in New York City. The group has partnered with American Express for its music series, “American Express Unstaged,” for the sweepstakes. Fans can enter to win tickets today through Thursday on Dead & Company’s website. No tickets for the show will go on sale.