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.
On the home screen, swipe down from the top of the
Tap > Accounts > >
In the Calendar Name field, enter a name for the
In the Server Address field, enter the address for the
public calendar in ICS format.