The theater isn't that large but neither were the ones with the screenings in Asia.
http://www.downtownindependent.com/page/facilities-1
- 222 Stadium style seats, including 16 reclining sofa seats.
That's about 888~ or so fans that can attend? Maybe more in the sofas? It's interesting to note that the theaters that showed this in Japan were only slightly larger than this one.
I already know a handful of people who are going (not from here) and since it's being advertised to most Japanese people in the LA area, I imagine a majority of the audience is going to come from them and not from forums.
I should really get my tickets soon just in case...
They also ask in the purchase about what other artists' concerts people would like to see. I wonder who will be next!