Hey,
i think this is very complex because the module does not know on which page you are.
But the first solution that would be possible is to use jQuery after loading the complete page.
So you can add some javascript code in the override of event details.
And every time the event details are loaded, the javascript code is executed.
The code could something like that pseudo-code:
Code:
$( document ).ready(function() {
$("#jemmodulebasic").find(hyperlink with attribute containing <?php echo $this->item->did; ?>).css("font-weight", "bold");
});