In Hail you can link your Google Calendar to publications and the hail built-in website.
To add a Google Calendar
Go to Settings
Find Google Calendar.
We do require a specific format.
It needs to be a PUBLIC Page
Typically a google calendar will look like this: https://firstname.lastname@example.org
To test make sure you can access this link from a browser window; this will confirm that the link is publically available.
In Hail all we need is the last part of the public address - in this example it will be: email@example.com
(the section after src=)
Add this to the settings and click 'tick' to confirm.