Thanks Geraint, but I don't believe that's my issue (or I am not following, so apologies in advance).
We create the event information in a different process (a review of a document) but the code which supports this review has the information necessary to create an event (dates, times, descriptions etc.). We want to automatically generate this event in the jevents calendar WITHOUT any further user interaction, ideally in the back end.
The calendar will then be accessed by users to see what events exist, download etc. as per normal, however, the CREATION process is systemic.
If I have been following the thread, I can create my event as an .ics file but I am still no wiser as to how the back end (by default php) can call the correct jevent routines to import this file.