Howdy Eileen,
Great question.
By default Editors do not have the “import” capability in WordPress, and can thus not mass import any sort of data including Events. If you wish to change this though you can do so using a plugin like User Role Editor. Simply add the import capability to the Editor role and you should be all set.
We actually have a feature request for this you might be interested in voting on: Allow non-admins to import via CSV But it is doubtful we will ever change the default here because doing so would run contrary to WP’ best practice.
Does that all make sense? Will that work for you? Please let me know.
Cheers!
– Brook