Please go to theme directory open single-fw_event.php


Replace this script form line number 5 to 10 


Before


<div style="background:url(<?php echo kvalue( $settings,'post_banner_image');?>);" class="banner">
  <div class="container">
  <h1><?php echo kvalue($settings, 'post_banner_heading'); ?></h1>
  <div class="bread-bar clearfix"> <?php echo get_the_breadcrumb(); ?> </div>
  </div>
</div>


After


<div style="background:url(<?php echo kvalue( $settings,'event_banner_image');?>);" class="banner">
  <div class="container">
  <h1><?php echo kvalue($settings, 'event_banner_heading'); ?></h1>
  <div class="bread-bar clearfix"> <?php echo get_the_breadcrumb(); ?> </div>
  </div>
</div>


Your event detail banner issue will be solved.


Thanks