Enable of public links for events in public calendars that non-members of the organization can embed in their personal calendars

Is your feature request related to a problem? Please describe.

In the present Calendar app I do not see a way to allow anonymous users to subscribe to a public event on their calendar (be it Google or other).

Describe the solution you'd like

I would like to be able to share a single event in a public Calendar, the same way one shares a public event in a Google calendar. I have an upcoming event spanning for some weeks and would like people interested in the World wide web to be able to click on a link I send by email or put in my webpage and be able o add the event to their different calendars (Google, Mac, etc.) in order to see them there and get reminders before the event itself.

Describe alternatives you've considered

1. Using Google calendar public calendar and the sharing of public events offered there.

2. Sharing the whole calendar as described here, but it is different from sharing a single event. Moreover when I click on the link generated by

on a Mac, first I get a download of the calendar then I should click on the download and add it to my calendar which is not straightforward for the average user.

What happens after that however is that I am prompted to subscribe to the created event, so I am not sure how the sharing of the calendar works after all...

Additional context

No response

No implementation files, tests, or entry points are identified. Start by tracing how public calendars and event links are currently exposed, then define anonymous single-event subscription behavior and verify that a shared event can be added to external calendars without exposing unrelated events.