I think this would be very useful if it was offered as a packaged element. That is, where the ICS content is added as part of the element, versus pointing to a separate ICS file.

I believe we could do this today, by creating the necessary ICS file and uploading it to the media library. Then snagging the URL for that file and creating the "Add to my Calendar" using native HTML.

<a href="path/to/your/event.ics">Add to Calendar</a>

The problem with this approach is that, depending on the number of events at any given church, there may be a problem with ICS file housekeeping.

Looking into this.