The calendar is published through Google Calendar and comes with all the functionality of this service. You can add the calendar to your own schedule, you can get reminders by e-mail, etc.
Although you need to log in to Google to gain access to the full set of functionality you can see a stripped-down version without registering.
The dates have been collected from a number of sources, including WPA, UMB, EPBF, World Snooker, WPBA, Global Cue Sports Centre and AzBilliards.
In the right column you'll find a button leading to the calendar:
