On the one hand, okay - it was fancier. However, I do not believe that any public air ceremony with fighting, dying, and live animals in it will be sedate. I’ve been to open air events in many continents, and people just aren’t naturally all quiet like when life and death things are happening. I just cannot imagine this behavior outside of a religious ceremony.
Even at the opera or live theater, both of which darken lights, light a stage, architect for acoustic carry, there is often shushing, resettling, multiple cues for the audience to sort of ‘settle down’ and pay attention. The idea that 50k people are going to watch some captured Christians face down a lion and make no noise while they were their Tuxedo equivalents seems to me to be in its own way a weird and just off Anglicism. I guess I might be straw manning her pitch a little, but I think she just over pitches this idea — I truly think a society that did that would be very, very unusual, to the point of being extremely creepy.