
Tap Alert on the Add Event screen or the Edit screen, if you want to add an alert to an event you already created. Tap how long before the event you want to receive an alert. You return to the Add Event screen, but another field is added under Alert, the Second Alert field. Tap Second Alert if you want to receive two alerts for the same event. Reminders on Mac. Reminders is already installed on your Mac so you just need to fire it up and add a few things to get started. The Reminders app is laid out in two columns. The left column shows you your lists. Note that it says ‘iCloud” at the top of your lists, meaning that anything there will be synced to iCloud.
Calendar User Guide
Use Alerts preferences in Calendar to set alert and notification preferences for events.
To change these preferences in the Calendar app on your Mac, choose Calendar > Preferences, then click Alerts.
