Allow HTML in announcements

Change-Id: I2b152c672f46cb6e37f2ab3d3265790d5fab069b
diff --git a/js/calendar-events.js b/js/calendar-events.js
index 457e895..e5aa05d 100644
--- a/js/calendar-events.js
+++ b/js/calendar-events.js
@@ -61,8 +61,7 @@
       dt.appendChild(time);
       element.appendChild(dt);
       const dd = document.createElement('dd');
-      const description = document.createTextNode(start.format("HH:mm") + "-" + end.format("HH:mm") + ` ${summary}`);
-      dd.appendChild(description);
+      dd.innerHTML = start.format("HH:mm") + "-" + end.format("HH:mm") + ` ${summary}`;
       element.appendChild(dd);
     });
   }