Guests cannot navigate to the calendar directly

In MDL-72834, the link to the calendar was moved into the user dropdown menu; guests do not currently have this menu, which means there is no way to directly navigate to the calendar (unless the site has a calendar block somewhere guests have access to, or provide the URL somewhere).

I'm marking this as a regression rather than an improvement, because this was previously available functionality, when the calendar link was in the drawer (3.11 or older).