What parameters are required to create an “Add to Google Calendar” link?

Question

We can use this link to add a new event to Google Calendar by parameters

https://www.google.com/calendar/render?
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Answer 1

The link from snoopy_15's answer points to an old Google URL that is currently being redirected to the new Google support page. This new page does not explain how to generate the kind of link asked in this question.

However, thanks to the wonders of Internet Archive: Wayback Machine, the older pages are still archived and available!

The latest available version is from March 2012, and it includes a form with a simple JavaScript code that still works! Sure, this is not an official documentation (and I'm still looking for one), and this is not even a documentation (it is an interactive form with a script), but it is the closest I could get.