When you no longer need a personal reminder you can easily remove it from your Calendar.
To remove a reminder from your calendar, you can:
Mark it done. The reminder stays on your calendar, but it’s crossed out.
Delete it, which removes the reminder completely.
Hide all reminders temporarily.
1) To mark a reminder done:
Do one of the following options:
If you have a single reminder in a time slot, click the reminder, and then click markasdone.
If you have multiple reminders in the same time slot, hover over the reminder block, click the reminder, and click Mark as done
2) To delete a reminder:
Click the reminder you want to update.
Do one of the following:
If you have a single reminder in a time slot, click delete.
If you have multiple reminders in the same time slot, click Edit and then click delete.
3) To hide all reminders: Under My calendars, click Reminders.