most of our schedule sets are confirmed before school starts, but for certain things like activities or teacher duties, they are typically added AFTER school year starts, which means that the scheduler has to remember to go to each of the future days that the school is closed, and manually cancel the newly added schedule set events. It would be great to have a setting like "no school days" BEFORE we start making schedules to notify the system that no future added schedule set events will be ever written into this day.