Set event alerts and receive notifications
Be notified of an upcoming Calendar event by setting one or more alerts for it. An alert can place a notification on your screen, send an email, or open a file.
To set a default alert for all events, see Change the default alert settings for events.
Set an alert for an event
Double-click or force click an event to view event details, then click the event’s time. (You can also select an event, then use the Touch Bar.)
Click next to Alert and do one of the following:
Choose a time or day from the pop-up menu.
Choose Time to Leave. This option only applies if you added a location. For information about how time to leave is calculated, see Add a location.
Choose Custom, then choose an option:
Message: Displays a notification on the screen.
Message with sound: Displays a notification on the screen and makes a sound.
Email: Sends you an email.
Open file: Opens the file you choose.
To add another alert, place the pointer over the Alert pop-up menu, then click the Add Alert button
.You can set only one alert for Exchange events.
To remove an alert, choose None from the Alert menu.
Turn off alerts for a calendar
Control-click the name of the calendar in the calendar list, then choose Get Info.
If you don’t see the calendar list on the left, choose View > Show Calendar List.
Select “Ignore alerts,” then click OK.
Show or hide all Calendar alerts
Choose Apple menu > System Preferences, then click Notifications.
Click Calendar on the left, then select whether you want invitation notices and event alerts to appear as banners or alerts, or to not appear.
Dismiss alerts
When an alert appears, you can either close it or temporarily dismiss it.
To never see the alert again, click Close.
To dismiss the alert for 15 minutes, click Snooze.
To choose how long to dismiss the alert for, click and hold Snooze, then choose an option.