Add end time limit to a contest

templates/organization/form.html

@@ -4,6 +4,13 @@
     <div class="alert alert-danger alert-dismissable">
       <a href="#" class="close">x</a>
       {{ _("Please fix below errors") }}
+      {% if form.non_field_errors %}
+        <ul>
+          {% for error in form.non_field_errors() %}
+            <li>{{ error }}</li>
+          {% endfor %}
+        </ul>
+      {% endif %}
     </div>
   {% endif %}
   {% for field in form %}