I’ve just finished writing up an add-on for Event Organiser which allows you to automatically import events from an ICAL feed.
The standard version of Event Organiser allows you to manually import events by uploading an ICAL file, but this ICAL Sync gives you the ability to easily add feeds and then forget about them: the plug-in periodically checks the feeds for updates, and automatically updates your events and trashes events which were at one point imported from the feed, but are no longer present.
This is incredibly useful for users who prefer to manage their events through their Google calendar, or if you have a network of sites and you wish to collate them on one ‘parent’ site (listing local WordPress meetups anyone?).
The add-on is just going through the last bit of beta-testing, and this is where you can help. Sign up to help beta-test the plug-in and get a free life-time license when the add-on is launched.