Control access to your calendar on Mac
Some apps and websites can use your calendars to provide you with services and features. For example, an app might use your calendar to help you schedule an event.
You can decide which apps are allowed to use your calendar information.
On your Mac, choose Apple menu > System Preferences, click Security & Privacy, then click Privacy.
Select the tickbox next to an app to allow it to access information from your calendars.
Deselect the tickbox to turn off access for that app.
If you turn off access for an app, you’re asked to turn it on again the next time that app tries to use your information.
If you allow third-party apps or websites to use your calendar information, any information they collect is governed by their terms and privacy policies. It’s recommended that you learn about the privacy practices of those parties.
For systems administrators who want information about deploying security settings, see the macOS Deployment Reference.