User must be granted access to add or modify events, sponsors etc. And must also be granted acess to the download module. Please note that no rights are checked in the backend module, users with access to this module has acess to all events.
The extension has a pretty complex structure, with lots of internal relations. Therefore it will probably be necessary for the administrator to set up plugins and folders containg events, sponsors etc. in a meningfuk way, so that regular users will only have to worry about entering data to the event.