Giving permissions to others to edit Calendar
1. Open Google Calendar
2. On the left hand side, under "My Calendars", click on the ellipses (...) to the right of your name.
3. Choose "Settings and Sharing"
4. Click "Shared with" from the menu options on the Left hand side.
5. Click "Add people and groups", and add the names of the people you want to give permission.
6. Choose "Make changes to events" in the Permissions box.
7. Click Send