Here are some links you can use to add/subscribe the Pack406 calendars to your local calendar agent:

Den1	ICS	HTML	Add to Google Calendar	CalDAV
Den2	ICS	HTML	Add to Google Calendar	CalDAV
Den3	ICS	HTML	Add to Google Calendar	CalDAV
Den4	ICS	HTML	Add to Google Calendar	CalDAV
Den5	ICS	HTML	Add to Google Calendar	CalDAV
Den6	ICS	HTML	Add to Google Calendar	CalDAV
Den7	ICS	HTML	Add to Google Calendar	CalDAV
Den8	ICS	HTML	Add to Google Calendar	CalDAV
Den9	ICS	HTML	Add to Google Calendar	CalDAV
Den10	ICS	HTML	Add to Google Calendar	CalDAV
Pack406	ICS	HTML	Add to Google Calendar	CalDAV