Within Outlook, select your Calendar at the bottom.
Once on the Calendar screen, right click on your calendar (the left side of the screen should have a spot that says "My Calendars").
Select the 3 dots to the side of the calendar you want to share.
Select the "Sharing and Permissions Tab" on the pop up box.
Click on the "Add" button and find the individual you are wanting to share access with.
Under the "inside your organization" section select the "Full Details" box.
Optional: If you would like them to be able to delete you can hit the trash icon, or you can change the detail they can see in the "Full details" box next to their email.