O.J. Simpson plans to sign autographs and pose for pictures at a Halloween-themed comic book convention in a rare public appearance coinciding with the 10th anniversary of his acquittal on murder charges, a promoter of the event said on Friday. Simpson agreed to show up at the NecroComicon show in Los Angeles for three days, starting on Friday night, as a favor to an unspecified friend who was paid in advance to arrange for the weekend appearance, according to the promoter, Tom Riccio. Riccio said Simpson, who now lives in Florida, was "not getting a penny" for his visit, but...