Define the base schedule as the quiet-week service
Write the base schedule against the premises as it operates in an ordinary week, with no event on. That gives you a stable figure that does not move, and it prevents the common error of building an average event load into the routine price. Averaged pricing feels convenient until a quiet quarter arrives and you are paying for activity that did not happen. It also gives you a clean comparison point when you later review whether the call-out structure is being used as intended.
The base schedule should still anticipate the building's event capability. Areas that only fill during events, such as function rooms, additional amenities or overflow parking, need a maintenance frequency even when unused, because dust and disuse have their own effects. Give them a low but stated frequency in the base so they are never in an unknown condition when an event is confirmed. A quarterly attendance in a rarely used function room is usually enough to keep it presentable and to catch anything that has developed since the last use.
