In addition to being able to manually update all iCal feeds at once, you can manually update just a single iCal feed.
- On the main calendar window click the Manage Schedules button to bring up the Manage Event window.
- Click the Schedules tab and select the iCal feed you wish to update.
- Click the Update Feed button to update just the one feed.
- Click Close to finish.
TIP: In addition to being able to manually update all iCal feeds from the main calendar window you can also do so from this page.
Manually updating all iCal feeds