how to make google calendar private?
If your calendar isn't shared with anyone, you might not see these settings.
Choose Micro niche category
Open the event you want to update.
Click Default visibility and choose the privacy setting for the event.
Note: When you change the privacy settings for an existing event from "Private" to "Public" or the visibility settings from "Busy" to "Free"
the change will apply to your calendar, but not to other event guests' calendars.