Storage that appears and disappears
Venues and warehouses handling event stock use their floor differently from week to week. An area that is a circulation route in a quiet period becomes a staging area with twelve pallets on it when something is on, then reverts. Neither state is wrong, but a cleaning specification written for one of them will be inappropriate for the other, and the mismatch shows up as a floor nobody has cleaned properly for a fortnight.
Linking the attendance to the event calendar solves it. The venue knows its dates well in advance, and a scope that names a pre-event, during-event and post-event pattern fits the way the building actually works. It also lets each attendance have a different task list, which is more useful than three identical visits at arbitrary intervals. It also lets the venue see what it is buying against each event rather than against a month.
