This site hosts a number of 'ical' format calendars which you can subscribe to using OSX Calendar, Google Calendar and other tools. You may be looking for "The Calendar" which is a formal document describing the rules of the university, you can find that at www.calendar.soton.ac.uk.
This site is run by the technical innovation and development team in iSolutions.
Outlook, iCalendar: For desktop applications you should just be able to click the subscribe button.
Google Calendar: For web-based services such as Google Calendar, you will need to cut and paste the address of the calendar into the service.
We automatically publish some calendars from sharepoint. If you would like a calendar added, and it has no confidential content, please file a request with serviceline and mention that it's for the attention of the "TIDT Open Data" team.