How many people can Ballroom 20 seat at the San Diego Comic-Con?

I'm wanting to go to the Game of Thrones panel at this years 2011 Comic-Con which is located in Ballroom 20. I would like to get an idea of how many this room seats so that I can estimate how early to get in line. Does anyone know how many seats ballroom 20 holds? And where is it located?
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