there is no official cosplay gathering liaison. With that in mind, there will be an official list set up. which means we have to do it for this year
as for locations these seem to be the best for locations
The outdoor walkway running between the ACC and the Hilton is a good place to hold gatherings, and where cosplayers tend to naturally congregate anyway.
There is a space in Hall B
So it looks like its up to you Stiches
Anyways for all of my gatherings KH, Disney and marverl vs Capom, I'll be having them at the outdoor walkway.