Don't try to render the body if it doesn't exist

templates/node--uw-event.tpl.php

@@ -105,7 +105,9 @@
       <?php
         print render($content['field_event_date']);
         print render($content['title_field']);
-        $content['body'][0]['#markup'] = uw_ct_web_page_filter_summary($content['body']['#items'][0]);
+        if (!empty($content['body']['#items'][0])) {
+          $content['body'][0]['#markup'] = uw_ct_web_page_filter_summary($content['body']['#items'][0]);
+        }
         hide($content['title_field']);
         hide($content['field_blog_date']);
         print render($content);