You can quickly give another person specific permissions to your calendar from the Navigation Pane.
- In Calendar, by right-clicking Calendar and clicking Properties.
- Select the Sharing.
- Locate the person from the Add User window by clicking Add User...
- To add the user click Add -> and then click OK.
- The default permission level is Author (Can read and create items). This can be changed by selecting Reviewer (Can read items) or Editor (Can read, modify, and create items) from the Permission Level: drop down selection. In addition permissions can be manually edited by the check mark boxes under the drop down for Permission Level:.
- Click OK.