Thanks Aeiou!
If you look in the bottom left-hand corner of the page, you can see an iCal icon. If you click this, you can import the gigs on this site into your iCal/Google Calendar/Outlook etc.
It's still in development so at the moment it just includes all the gigs on the site at the time you click it, unfortunately not as an updating feed yet.
The plan is to enable users to choose and export individual gigs, or their "My Gigs" from their profile.
Thanks again,
Craig