Taken from Miss Info, you can explain it better than me (being that she was there):
Gig It? We were pretty confused by the name, too. But last night, NYC media folks were invited out try out the new online game with a ton of special guests. 90% of them being rappers. Everyone from Rick Ross, Pusha T, Raekwon, Ace Hood, French Montana, Fabolous, Busta Rhymes, Nas, 2 Chainz, DJ Khaled, Slaughterhouse, Large Professor, Ace Hood, Ne-Yo, Jaime Foxx, T-Pain and more were roaming around the VIP. The game basically allows you to pick real rappers and customize a custom concert with every detail catered to your liking. You can choose the music, backup dancers, speakers, opening act, headline performers, wardrobes, sponsors, etc. So far all of the artists mentioned are in the game, with more big announcements to come.