minor update

layouts/events/single.html

           <img class="img-fluid mb-50 lozad" data-src="{{ .Params.image | absURL }}" alt="blog-image">
         {{end}}
       </div>
-      {{ range .Params.event_speakers }}
-        <div class="col-lg-8 offset-lg-2 mb-3">
-          <h4>
-            Speakers
-          </h4>
+      {{with .Params.event_speakers}}
+      <div class="col-lg-8 offset-lg-2 mb-3">
+        <h4>
+          Speakers
+        </h4>
+        {{ range .Params.event_speakers }}
           <div>
             <div class="client-thumb speaker">
               <img class="img-fluid lozad" data-src="/images/client/client-1.webp" onerror="this.onerror=null;this.src='\/images\/client\/client-1.jpg'" alt="Lemos Kail" src="/images/client/client-1.webp" data-loaded="true">
             </div>
             <div class="bio">{{.speaker_name}} {{.bio}}</div>
           </div>
-        </div>
+        {{end}}
+      </div>
       {{end}}
       <div class="col-lg-8 offset-lg-2">
         <div class="post-single-content">