PHILADELPHIA — Less than an hour before the 8 p.m. tipoff, Philadelphia 76ers employees are scurrying around the Wells Fargo Center, hoping this Saturday night unfolds as planned. It's late March, and the team is handing out Allen Iverson bobblehead dolls. Iverson himself is scheduled to attend, a rare public appearance for the 37-year-old former NBA superstar. He'll be introduced during a pregame ceremony and then watch the game from Sixers chief executive Adam Aron's suite. But Iverson isn't here yet, and a troubling rumor is passing through the arena's arteries: Iverson has missed his flight.