Hi Haki,
I have made some modifications on your site on this path .../administrator/components/com_easysocial/controllers/events.php. This happens because of your joomla version. It is incompatible with current EasySocial version.
I would advice you to update/upgrade your latest version to make sure everything is working and compatible with our latest version components. Thanks for your understandings
.
By the way, i have deleted all glitched rejected event on your site.