Edit the following file

includes\cal\CAL_mwCell.inc.php

Change line 40 to suit your needs.

<div><a href="<?php echo  CAL_XHTML_Url($data['event'][$i]['link']);?>" title="<?php echo $data['event'][$i]['desc'];?>" <?php if ($this->calendar->getViewEventTarget()!='') { ?>target="<?php echo $this->calendar->getViewEventTarget(); ?>" <?php } ?>><?php echo $data['event'][$i]['title'];?></a></div>

The red bit are the custom hack

<div>            <?php             // Show link if logged in            if ($_SESSION['kt_login_id'] != ''){;?>            <a href="<?php echo  CAL_XHTML_Url($data['event'][$i]['link']);?>" title="<?php echo $data['event'][$i]['desc'];?>" <?php if ($this->calendar->getViewEventTarget()!='') { ?>target="<?php echo $this->calendar->getViewEventTarget(); ?>" <?php } ?> rel="nofollow"><?php echo $data['event'][$i]['title'];?></a>            <?php } else {                 echo $data['event'][$i]['desc'];                }            // End Show link if logged in                ?>            </div>

You will also want to do the same for the Day view file

CAL_ViewDay.class.php

Line: 171

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