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You can only give other users within your project permission to create events by following these steps. Follow these steps to add someone to your project.
Steps
Go to the Project Preferences page
Check that the Enable Events checkbox has been ticked
Add the names of Project Reporters and Project Observers whom you want to be able to create events within this project. You don’t need to add Project
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Managers as they will automatically be given permission once events have been enabled
Press Save
You arrive back on the project page