You’re welcome. I’m sorry but for the moment, my priority would be ical url exports from discourse events and not import, but I will share here if I ever come up with something. For now I just modify small stuffs like here to improve the create event button placement that is by default hidden in the plus menu.
Regarding your script and its content injection in the topics body, I remember that in the past you could add the syntax below to the composer and get an event created out of it 
As it doesn’t work anymore, I wonder if anyone knows if there is a new syntax as this could be integrated to your script in order to have the external event visible in the calendar of the category and in the global calendar as well.(well I don’t know if this would be as easy as that but who knows)
It used to be this syntax :
[event start="2025-11-16 19:00" status="public" name="585 test event" timezone="Europe/Paris" allowedGroups="trust_level_0" end="2025-11-16 21:00"] [/event]