Access is the first thing to change
On an event day the ordinary approach to a building may be closed, parking may be unavailable and traffic management may prevent a vehicle reaching the premises at all. None of that affects the cleaning task itself, and all of it affects whether the attendance can happen. Establishing the access position for event days is the first practical step.
The workable response is usually a different time rather than a different route into the premises. An attendance placed well before the event build-up begins, or well after the crowd has dispersed, avoids the restriction entirely without any other change. Because event days are published a long way in advance, that adjustment can be rostered rather than improvised, provided somebody is actually checking the calendar.
