Add GameManager for filtering active games and update group_games template

game/templates/game/include/group_games.html

@@ -1,5 +1,10 @@
 {% load form youtube %}
 {% if group.musikgame_set.exists %}
+    {% for game in group.musikgame_set.playing %}
+        <a class="running" href="{{ game.get_absolute_url }}">
+            <article><i class="ri-play-circle-fill i"></i>{{ game.date }}</article>
+        </a>
+    {% endfor %}
     <h2>
         <i class="ri-play-circle-fill"></i> Parties
     </h2>