The stadium grows to be unintentionally destructive whilst creating a space. I think this can be translated into the TS by focusing on either the excavation of the continually expanding stadium; or the roof that continually expands.
The ring only exists when there is a fight/conflict. At all other times it is just a hole in the city. When a fight is staged the rest of the city empties to become eerily spooky and dead:
Perhaps the fabric in the roof somehow commemorates battles that were previous fought; so that with each battle that is won the roof expands (or maybe this is too literal). Utopian designs literally exist in the stadium at times of conflict when the roof is deployed. I’ve started this collage, showing a fight underneath a roof of utopian plans that obscure the real view of the towering city that collides with the stadium above:
Some inspiration from Montreal: