Appointment custom fields
From MoodleDocs
This feature is part of Moodle Workplace™, which is available through Moodle Certified Partners and Service Providers only.
To manage user-defined appointment fields, you can either go to Site administration > Plugins > Activity modules > Appointment custom fields or select the Manage custom fields link underneath the Description text box Advanced settings in the Appointment activity.
During the installation, three custom fields will be created automatically: Location, Venue, and Room. You may choose to delete them manually and remove them from the notification templates (via language strings).
Appointment custom fields work in precisely the same way as any other custom fields in Moodle, for instance, courses. Appointment custom fields can also be used in the email templates of appointment notifications.