View file PF.Base/module/event/install/version/3.5.0rc1.xml.php
<upgrade>
<sql><![CDATA[a:1:{s:7:"ADD_KEY";a:1:{s:21:"phpfox_event_category";a:1:{s:8:"name_url";a:2:{i:0;s:5:"INDEX";i:1;s:8:"name_url";}}}}]]></sql>
</upgrade>
<upgrade>
<sql><![CDATA[a:1:{s:7:"ADD_KEY";a:1:{s:21:"phpfox_event_category";a:1:{s:8:"name_url";a:2:{i:0;s:5:"INDEX";i:1;s:8:"name_url";}}}}]]></sql>
</upgrade>