Since many people gather to watch the shows, they are often held in large spaces away from the main areas (good locations also require high rental fees so are often avoided) and are so called because they occupy a lot of space.
客寄せする技術があり人がたくさん集まるので、目抜きから離れた広い場所で行う事が多く（良い場所は庭場料も高いのでそれを避ける意味合いもある）大きな場所占めるのでこの様に呼ばれる。