So all the app developers can participate in this Gaming festival. All the interested participants can submit their Games to the Google by Aug 14 and then Google will decide which games should be presented in the Conference or not.
One bad news is that Google has officially declared that Public companies can't participate in their Gaming festival.
Google will choose 30 Games which will be presented at the showcase. The winners will also get the prizes like Google Tango and lot more.
So all app developers must participate in the scenario.
Best of luck.