This question was asked in 2017 and not answered - so I thought I'd try again. So...
I've been training and need to delete some test events...
How does a back end user DELETE and event?
I'm not sure that you can delete events at this time, you can however unpublish them so that they are not visible to the public. Go to the event that you want Customize > Costomize Event > Genreral > Event Visibility > Select "Hide Event From the Public". The only other option would be to go into the database I believe and remove the records from there.
as far as removing from the database
sudo mysql > use (the database name) > DELETE FROM events WHERE title = "Event Name";
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