Short answers, pulled from the story.
Hurricane Katrina caused flooding that made the New Orleans Arena unusable for the 2005, 06 season. The team played thirty-five games at the Ford Center in Oklahoma City and six games at the Pete Maravich Assembly Center in Baton Rouge.
The league announced on the 31st of January 2006 that the team would remain in Oklahoma City for the 2006, 07 season. The franchise made its permanent return to New Orleans on the 31st of October 2007 when they defeated the Sacramento Kings.
The New Orleans Hornets became the first team since the 1974, 75 Boston Celtics to play home games at four separate venues. They utilized the Ford Center in Oklahoma City, the New Orleans Arena, the Pete Maravich Assembly Center in Baton Rouge, and the Lloyd Noble Center in Norman, Oklahoma.
Playing in the Ford Center resulted in an average of 18,168 fans per game representing a 78% increase from previous attendance figures. The team had finished last in attendance during the prior season while based in New Orleans before the storm.
In 2013 the franchise changed its name to the Pelicans paving the way for a return of the Hornets name to Charlotte. That original home replaced the Bobcats name one year later after the Seattle SuperSonics relocated to Oklahoma City for the 2008, 09 season as the Thunder.