Set an event as either “Public” or “Private” and I understand the permissions associated with those settings

If you've decided to share a calendar with someone, they'll normally see all the events on that calendar. If you want to make a particular event private, so only you and other calendar "owners" can see it, you can mark it as a private event. To do so, follow these steps:

1. Click on the event and select Edit event details. You can also click the event's title to open the event details page.
2. In the Privacy section, select the Private radio button.
3. Click Save.