User will need to have access to view Events in the Raiser's Edge. To ensure they have access you can follow these steps:
  1. Login as a user with Supervisor rights or login as Supervisor
  2. Navigate to Admin > Security
  3. Open the User Group the user is a member of
  4. Under Group Privileges, select Records and then the Options button to the right
  5. In Security Options, select Events on the left
  6. Set security rights to Events for the group on the right 
For more information on setting up Security in The Raisers Edge, please reference How to set up security.