Hi there,
You can do modification at this path
.../components/com_easysocial/themes/wireframe/helpers/event/action.php on codes and see how it goes.
[gist type="php"]
//You can remove them accordingly
//when users are invited and awaiting their respond
<?php } else if ($isInvited) { ?>
<?php echo JText::_('COM_EASYSOCIAL_EVENTS_RSVP'); ?>
<?php } ?>
<?php } else { ?>
<?php echo JText::_('COM_EASYSOCIAL_EVENTS_GUEST_GOING'); ?>
<?php } ?>
//Past events
<?php } else { ?>
<?php echo JText::_('COM_EASYSOCIAL_EVENTS_GUEST_GOING'); ?>
<?php } ?>
[/gist]
Do make template override for them as you can refer here
https://stackideas.com/docs/easysocial/administrators/templating/template-overrides *in case you using different template, you still need to edit them on wireframe template
Please give it a try and see how it goes.