The event link makes it look like it's just referring to the theater. It even mentions a "door time".
Even if it is the whole hall (which used to be the Exploratorium, back in the day), there's still no way in hell they'd get 30,000 people inside. According to https://palaceoffinearts.com/info/, the maximum capacity of the facility is 5,000, and even that would be very crowded.