Event
Every day is anchored to this Monday. You only type times: change the start date and the whole schedule moves with it. Days without sessions are not shown on the displays. New event clears all sessions (roles and categories are kept).
View filters who sees what
Filters appear as SHOW FOR buttons on the displays. A TV can be pinned to one by adding ?role=CREW to its address. Deleting a filter removes it from every event that used it. Events with no filter are shown to everyone.
Categories colour bar next to each event
Deleting a category reassigns its events to the first category in the list.