district: Fix pirate center calendar when root page calendar does not exist

shared/templates/shared/small_calendar_snippet.html

@@ -4,7 +4,7 @@
   </h2>
 
   <div class="mb-4">
-    {% for event in events|default:page.root_page.calendar.current_events %}
+    {% for event in events %}
       <div class="grid grid-cols-12 items-center calendar-table-row calendar-table-row--standalone">
         <div class="col-span-2 text-orange-300 head-alt-md calendar-table-row__col">
           <span>{{ event.start|date:"j." }}</span>