Update event.md

Author: felixkoerber

_pages/event.md

@@ -207,7 +207,7 @@ body {
                 <div class="col-md-3 mb-3">
                     <div class="card custom-card">
                         <div class="card-body text-center">
-                            {% if speaker.image %}
+                            {% if speaker.picture %}
                                 <img src="{{ speaker.picture }}" class="img-fluid rounded-circle mb-3" alt="{{ speaker.name }}">
                             {% else %}
                                 <i class="fas fa-user-circle icon-feature"></i>