Run capacity live, not as an estimate. The number inside is a licensing matter as much as a safety one, and a door supervisor counting in his head at half past midnight is how venues lose a licence rather than a night.
Cost each night as an event, not as a shift. Fee, percentage, travel, tech and staff belong to the same Friday, and without that arithmetic nobody can say whether the headline act paid for itself or was simply a good night out for everyone.
Separate the takings before the staff leave. Bar, cloakroom, tips and table service become one unsplittable number by Monday morning, and the argument that follows is unwinnable in both directions.