Use reminders in Calendar on Mac
You can view, create, edit and complete scheduled reminders from the Reminders app in Calendar.
Show reminders
You can show scheduled reminders you added to the Reminders app 
in Calendar.
Go to the Calendar app
on your Mac.Select the Scheduled Reminders tick box in the calendar list.
If you can’t see the calendar list on the left, choose View > Show Calendar List.
Reminders scheduled as all day appear in the all-day section at the top of the calendar. Reminders with a time appear next to a specific time in the full-day schedule.
To remove reminders in Calendar, deselect the Scheduled Reminders tickbox.
Create reminders
Go to the Calendar app
on your Mac.Click
in the toolbar, then click New Reminder.Enter a title for the reminder.
Click the date next to “remind me” to choose a date for the reminder. Optionally, select At a Time and enter a specific time for the reminder.
You can also add other information — like images, notes or a priority level to a reminder. See Add or change reminders.
You can select a specific Reminders list where new scheduled reminders are added. If you don’t select a list, new reminders are added to the default list you chose in the Reminders app. See Set the default reminder list.
Completed reminders
Go to the Calendar app
on your Mac.Select
next to the reminder’s name.Completed reminders are dimmed. To mark a reminder as uncompleted, deselect
.
Note: If you set a scheduled reminder to repeat, future instances are dimmed and can only be marked completed after the most current instance is marked completed.
Edit or delete reminders
Go to the Calendar app
on your Mac.Do any of the following:
In Week or Month view, double-click or force-click a reminder to open it and edit the details.
In Day view, click a reminder to open it and edit the details.
To delete, right-click a reminder and choose Delete. Deleted reminders move to the Recently Deleted list in the Reminders app for 30 days before being permanently deleted.