How to - Share your Outlook calendar

Share your calendar [Video: (See how it's done)]

Select Calendar > Share Calendar.
Choose a calendar to share.
Select Add, decide who to share your calendar with, and select Add.
Select OK and you'll see the added people with a default permission level.
Choose a name, select the access level to give, and select OK.

Reference: https://support.microsoft.com/en-au/office/share-your-calendar-in-outlook-2fcf4f4f-8d46-4d8b-ae79-5d94549e531b