For more than three decades, the Georgia Mountains Center has played host to job fairs, gun shows, concerts, graduations and even a wrestling match or two. But the downtown arena space has outlived its use and annual events that call the center home will have to find a plan B. Earlier this month, Brenau University officially moved into Gainesville’s convention center, now dubbed the Brenau Downtown Center, and will transform the building to house its new doctoral physical therapy program, set to open in January 2014. A major part of that transformation is converting the center’s 18,000-square-foot arena into two floors of classroom space.