Charlotte's NBA arena continues hot streak with help from Oprah, other stars

The Charlotte Hornets know how to fill the Spectrum Center. With a small wrinkle: Most of the time the toughest tickets at the team’s uptown arena are for concerts and other shows rather than NBA games. (Three years and counting without reaching the playoffs has put a damper on ticket sales.) This weekend offers another example. Oprah Winfrey’s 10-city interview tour includes a stop at Spectrum Center on Saturday, where the queen of all media will be on stage for a conversation with comedian…