2.5 hours means we're going to need extra glow sticks to give people since a lot of them are going to die. I hope we have a lot, I only have about 40-50 left over from Hawaii.
The regular ones should last long enough; they're supposed to be in the 8 hour range, no? This is a great reason to have battery powered glowsticks. We Fenix flashlight users could go full turbo mode (and cook our hands) for most of the concert.

BTW, according to
this post in the Fanime forums, there's an opening act, so she's not really doing a full 2.5 hour concert.
That post also says Momoi allows photo/video, though no flash photography. I don't know how that jives with the SJ Auditorium rules about recording in that venue. Maybe set up a tripod somewhere...as long as we're not trying to plug into the sound board or anything, they'll let it go.

(I'm thinking it's more for her panels and autograph sessions, but who knows?)
Also, it looks like it'll be general admission, so that's kind of a first in line, first in seats kind of configuration, no?