Hook seems to work with a single event, but not the subsequent instances of the event. Any ideas?
Interesting. It works with the Mac Calendar app, though.
With exactly the same event and same occurrences of that event?
Yes. But I would prefer to use BusyCal.
Just had a quick test — not used BusyCal in years. Repeating events worked for me on BusyCal (SetApp version) v126.96.36.199 and Hook v3.0.
Does the URL you get in Hook change with each occurrence? If you paste those URLs in your web browser do they work as expected?
Just thought, my test was using a local calendar. I’m assuming your calendar is synced?
If you create a local calendar with a repeating event, does it work as you want?