Most calendar software supports iCal Feeds. Subscribing will import the feed into your calendar program, and updates will be pushed to you. To subscribe using Google Calendar, click the "Add to Google" button.
If your program supports iCalendar feeds, but not subscriptions, you can download a copy of the current calendar data and import it into that program.
To create an iCal feed for the calendar(s) you'd like to subscribe to, simply select the categories from the list below and then click the iCalendar Feeds button below the list.
Help using iCal Feeds