A festival site is a city for a weekend.

A permanent venue accumulates knowledge. Staff who know the building, habits that form, signage that eventually gets fixed, visitors who have been before. An event has none of that and never will. A hundred thousand people arrive at a place that did not exist last month, and everything they need to know has to reach them on the first attempt.

Signage takes weeks to produce and cannot change when the schedule does. A printed map is out of date before the gates open. A custom app costs a year for something that runs for nine days. Staff know the site by day three. The event ends on day four.

Six weeks from brief to something running on site, built by the principals rather than queued behind someone else's backlog.

Crowd distribution. Discovery of the second stage and the smaller act. Safety and flow. Staff load. Sponsor and vendor value, measurably.