No they do not have to tell you, in fact they are not allowed to tell anyone who is not directly connected to the case. ( defendant , victim, partner etc)
You may get the information from the local paper if they sent a reporter, but they don't bother with most cases.
The only sure way is to sit in the public gallery and listen to the case.
There is a publication called 'The Law Pages' that I believe reports all court cases but it is only available to registered lawyers / solicitors.