This would give a place for melee/unarmed oriented characters a place to shine. I disagree with the guns in the arena, it wouldn't make sense.
CL armorer: yeah hears a assault rifle, don't shoot any of the onlookers won'tcha?
PC:...................yeah sure. (proceeds to shoot the crowds in the bleachers.)
I wouldn't go to an arena where you'd get shot at, I payed good money to watch someone else be killed not me.
And CL would lose their money source from no one returning to watch the fights.
But maybe throwing spears and a 'possible' bow for range weapons.
And yes like awhile back we want a football stadium to be the arena, explains the abundance of shoulder pads worn by CL troops. Also a crucifix in place of the goal posts on each side.