Embed macOS server Caldav on website

We have users with multiple shared calendars and created a new user with the calendars we would like to publish, but I don’t want that the people have to enter credentials to access it. I want to embed it google-style on our website.

Does anyone know of a way to embed a list of calendars for a user on macOS Server High Sierra on a company website?

I have tried every creative solution I can think of.