Subscribe to a public calendar on your device
Make sure you have the address for the public calendar in iCalShare (ICS) format.
You can add a public calendar that uses the ICS format to your BlackBerry device so that you can see that calendar in the 
Calendar app. When the owner of the calendar makes changes to events, the changes are synced to your device. Only the 
owner can change events in a public calendar.You can also open public calendar links in the BlackBerry Browser or in an 
email and quickly add them to the calendar in the Calendar app.
1.
On the home screen, swipe down from the top of the screen.
2.
Tap
> Accounts >
> Subscribed Calendar.
3.
In the Calendar Name field, enter a name for the calendar.
4.
In the Server Address field, enter the address for the public calendar in ICS format.
5.
Tap Done.
Tip: If you tap a link to a public calendar you don't subscribe to in the BlackBerry Browser, you are automatically directed 
to the Subscribed Calendar screen, and information about the public calendar is automatically populated.