Duke press release
"DURHAM, N.C. – The Duke men’s basketball team will open the 2008-09 regular season on Monday, Nov. 10 against Presbyterian at 7:00 p.m. on ESPNU in the opening round of the 2K Sports College Hoops Classic Benefitting Coaches vs. Cancer. Georgia Southern and Houston will meet at 4:00 p.m. at Cameron Indoor Stadium on Nov. 10 in the other first round contest. The first round winners will play at 9:00 p.m. on Tuesday, Nov. 11 for a chance to advance to the semifinals of the event at Madison Square Garden. There also will be a consolation game at 6:00 p.m. on Nov. 11 at Cameron Indoor Stadium."
I believe the last time this happened they just switched out the visitors section after the first game. IIRC Cameron was nearly empty and the ugrads ran back and forth from end to end as the ball moved cheering at each end of the floor for a good portion of the game.
For non-visitors section tickets, one ticket allowed you to watch the Duke game and the non-Duke game preceeding it. You just can't leave once you're in. Although, that's true for all games in Cameron.