Atlanta is the center of the sports and entertainment world this weekend. Now the games really begin. The two national semi finals take place at the Georgia Dome Saturday.  But there is a day full of activities leading up to it.

• 10 a.m. - 8 p.m. - Bracket Town opens at Georgia World Congress Center. Featured autograph sessions: 11 a.m.-12 p.m., Dick Vitale 11:30 a.m. - 12:30 p.m., Elgin Baylor 1:30 - 2:30 p.m., AJ Green 4:15 - 5:15 p.m.
• 12:15 p.m. - Yacht Rock Revue concert - Centennial Olympic Park
• 1 - 2 p.m.  - Battle of the Bands at Bracket Town
• 1:45 p.m. - Macklemore and Ryan Lewis concert - Centennial Olympic Park
• 3:15 p.m. - Ludacris concert  - Centennial Olympic Park
• 4:30 p.m. - Flo-Rida concert - Centennial Olympic Park
• 6:09 p.m. - National Semifinal No. 1 - Louisville vs Wichita State - Georgia Dome (Doors open at 4 p.m.)
• 8:30 p.m. - Muse concert - Centennial Olympic Park
• 8:39 p.m. - National Semifinal No. 2 - Michigan vs Syracuse - Georgia Dome