plainui: hide official assembly name on events

i.e. don't show "CCC" on event list entries or detail page

src/plainui/jinja2/plainui/components/list_events.html.j2

@@ -73,10 +73,12 @@
           </div>
         {% endif %}
 
+        {% if not event.assembly.is_official %}
           <div class="hub-tag__text">
             <i class="bi bi-person-arms-up"></i>
             {{ event.assembly.name }}
           </div>
+        {% endif %}
       </div>
 
       <div class="hub-tags">

src/plainui/jinja2/plainui/event.html.j2

@@ -49,7 +49,8 @@
 
     {% set current_assembly = {
           "link": url('plainui:assembly', assembly_slug=assembly.slug),
-          "name": assembly.name
+          "name": assembly.name,
+          "is_official": assembly.is_official,
         } if assembly and assembly.slug else {} %}
 
     <div class="hub-vlayout">
@@ -157,7 +158,7 @@
           {% if event.description_html %}
             <div class="hub-text">{{ markdownMacro.markdown(markdown=event.description_html | safe, border=False) }}</div>
           {% endif %}
-          {% if current_assembly %}
+          {% if current_assembly and not current_assembly.is_official %}
             <div>
               <h2 class="hub-section-title">{{ _("Assembly") }}</h2>
               <div class="hub-text">