How do I get my iCal feed to show past events?
Simply add the param &amp;start=YYYYMMDD

On the html side use civicrm/?page=CiviCRM&amp;q=civicrm/event/ical&amp;reset=1&amp;list=1&amp;start=20070101&amp;html=1

on the ical side use /civicrm?page=CiviCRM&amp;q=civicrm/event/ical&amp;reset=1&amp;list=1&amp;start=20070101

In that example 20070101 is January 1st 2007 - you can change the date to whatever you would like.