Located at the bottom of the Event Calendar on left panel, select Manage Important Dates.
Select Add Important Date.
Fill out the Important Date fields to establish the date. Keep in mind Disabled Dates will prevent bookings in the Sites/Locations that are selected. Holidays can be set to disabled as well. The fields to complete include:
Date
Important Date Type
Disabled Date
Holiday
Note
Sites
Locations
Title of Important Date
Message to Display.
Save Important Date.
Once the Special Dates have been added, a message note will appear on the calendar for that date.