Google Calendar Hidden Events. But you could change the background color for that event to a color which indicates, to you, the event is not. This article explains how to make an event private in google calendar, as well as the different sharing options in the app.

If you click the settings gear at the top of the page and go to settings, along the left you’ll see all calendars including hidden ones (they’ll have an eye with a line through it next to. If you set your calendar to only show events as ”free” or ”busy” for everyone, event details can be visible to others to whom you assigned different visibility settings.