@hypolite I am not supposing to delete it. I supose to change the theming code that in does allow it and then have the core code fixed.
But as I don't know what exactly happening on code level, it's hard to decide.

About the additional issue: This is already there, isn't it? When logged out I see that calender link, but by clicking I am forced to log in. So no public access anyways atm.