Awesome. So just like any other URL, just create the .ics and host it somewhere where it is accessible via a url and make it “public” so anyone who gets it can access it, then shorten the URL and we should be good!   thanks. 

Why couldnt we use the same principles they have here for email, and just create a url to link to the .ics that when a person clicks said link they could have that file download and add the .ics to their calendar? https://www.litmus.com/blog/how-to-create-an-add-to-calendar-link-for-your-emails