One minute we can be in a small club, the next minute we can be in a coliseum, and the next minute we can be in a small auditorium. It varies, depending on the promoter, the budget, and the travelling distance. ↗
You need to look at Congress as having a certain capacity. Now, the capacity varies from year to year and from body to body, but there is a finite amount of things that Congress can attentively do. ↗