(https://tech.lds.org/wiki/Calendar_FAQs#Requests.2C_Roadmap.2C_and_Missing_Features_Questions)If you select Private, the event details will not be visible to anyone except those who you added as viewers for the calendar. Others will be able to see that an event exists, but the event will simply say “private event.”
(https://tech.lds.org/wiki/Managing_calendars)Members can see events for private calendars on the calendar, but they cannot see the name or details of any private calendar events.
However, when I created a test private calendar and private event on it, my wife's account (with no calendar administrative rights) was able to see the name, calendar name, time, location, resources, setup/cleanup time, and contact info. The only thing that wasn't visible was the content of the description field. These details were available from the "View Event Details and Location" link.
I understand the the only thing that's deviating from the advertised functionality is that the name of the event is being displayed. (I hope this isn't an issue with people using the event name for confidential events.)
I would propose that more things be "private" on the private calendar (or be optionally so). The events I would include on a private interview calendar typically take place in rooms that aren't available for scheduling, so I wouldn't worry about conflicts. Thus, showing the event to prevent conflicts doesn't seem necessary. Also, the private calendar name doesn't seem like information that needs to be shared.
Do other people have suggestions for using private calendars for interviews?