source/php/PostTypes/Events.php
public function eventContentLead($lead)
    {
        if (!is_singular($this->slug)) {
            return $lead;
        }

        $custom_content = $this->getCustomContent();
        if ($custom_content) {
            $lead = null;
        }

        return $lead;
    }
public function eventContentLead($lead)
    {
        if (!is_singular($this->slug)) {
            return $lead;
        }

        $custom_content = $this->getCustomContent();
        if ($custom_content) {
            $lead = null;
        }

        return $lead;
    }
Remove lead content if the occasion has custom content
@param  string $lead Lead content of the current post.
@return string