Calendar color is big. It tells at a glance what's going on and color conveys info fast. The more variations you use the more valuable the calendar is. Ideas....
  1. A different background shade for working hours/days vs. non-working hours/days.
  2. Different color for personal appts vs. inspection appts.
  3. Different color for incomplete appts (on hold appts that don't have all the info yet to send out emails) vs. complete appts.
  4. Different color for requested inspector appts vs. other inspector requested.