Add function for getting events for a talk

GH-160

source/_partials/talk/events.html.twig

@@ -1,13 +1,14 @@
 {% import 'helpers' as helpers %}
 
-{% if page.events %}
+{% if events %}
     <div>
-        <h2 class="mb-2">Presented at</h2>
+        <h2>Presented at</h2>
 
-        <ul class="markup list-disc ml-5">
-            {% for event in page.events if not event.date is empty %}
+        <ul class="markup mt-2 list-disc ml-5">
+            {% for event in events %}
                 <li>
                     {{ helpers.talkEventName(event) }}
+                    {{ helpers.talkEventLocation(event) }}
                     <span class="text-gray-800">- {{ event.date|date('jS F Y') }}</span>
                 </li>
             {% endfor %}