It should be possible to
hard code TubaDave's mod into the template rather than allowing users to select which events to see.
But if you want to do it the hard way, find each occurance of
<%FOREACH EVENT%>
in the default.html template and add this line after it
<% next if ( $EVENT->{'details'}->{'Field_Name'} eq "category_C" ); %>
Where Field_Name is the name of the field that will contain the value "category_C".
Dan O.
PS. It may not hide them from a search's results though.
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[This message has been edited by DanO (edited December 02, 2002).]