The most I've heard of going on at the Nokia Theater was a 5,000 seat Christmas Show held by a morning show for KLOS Radio. Though they added seats after selling out, so the exact number isn't known to me. I'd have to get a brochure from the Nokia to answer that with any certainty.
Would surprise performances by highly-regarded talent also help? I don't mean 100% unannounced appearances, but appearances made by high-level talent is announced, but not their identity.