I am using URE pro togehter with Events Manager (free version) see here which comes with its own extra capabilities.
The new caps show up perfect in URE.
But when URE is active, they dont do anything. Only admin is allowed to enter new event.
I manaually gave (for testing purpose) add-event-cap to everyone (Admin, Editor, Author and so on) in both URE and EventManager.
Still the same: URE deactivated – everything works fine as expected. URE activated – only Admin can add new event.
Look at the “Settings->User Role Editor->Additional Modules” tab. If this option “Activate “Create” capability for posts/pages/custom post types” is turned ON, role should have ‘create_events’ capability to have permission to add new events.