You can create and choose how to render why-unavailable
terms. Note that why-unavailable can mean a special purpose (i.e. why the schedule item
is generally unavailable). For example at
a tennis club, maybe some courts and times are reserved for people to play volleyball.
You can also choose how to render built-in why-unavailable terms, like "Taken".
You can create and delete permanent calendar colors. Perhaps you do not
like some PRESTO-assigned color, or perhaps you want to prevent color assignments
from changing over time.