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You know, if they aren't limited solely by theater halls, HoloEN could do concerts of 5000+ seats in almost every state in the country. Many places that aren't explicit sports stadiums can be repurposed into concert seating, fucking MAINE has civic centers that can hold like 9,000 people for music and performance events. Richmond Virginia has a stadium that holds like 13,000 people.
The only real limit is accessibility to the event, but it's not like LA is even good for that.