minor update

layouts/events/single.html

         <ul class="list-inline mb-50">
           <li class="list-inline-item">{{ dateFormat "Monday, Jan 2, 2006" .Params.event_start_date }}</li>
         </ul>
-        {{with .Params "image"}}
+        {{if isset .Params "Image"}}
           <img class="img-fluid mb-50 lozad" data-src="{{ .Params.image | absURL }}" alt="blog-image">
         {{end}}
       </div>

layouts/events/upcoming.html

 <article class="col-lg-4 col-md-6 col-12 clearfix wow fadeInUp mb-4" data-wow-duration="500ms">
     <div class="post-block">
-      {{with .Params "image_webp"}}
+      {{if isset .Params "Image_webp"}}
       <div class="media-wrapper">
         <img class="img-fluid lozad" data-src="{{ .Params.Image_webp | absURL }}" onerror="this.onerror=null;this.src='{{ .Params.Image | absURL }}'">
       </div>