Fix HTML entities in the event organiser email

website/events/templates/events/organiser_email.txt

@@ -2,5 +2,5 @@
 
 A member that was registered for the event '{{ event.title }}' that you're organising has cancelled their registration after the deadline.
 
-Name: {{ registration.member.profile.display_name }}
+Name: {{ registration.member.profile.display_name|safe }}
 Registration date: {{ registration.date|date:"SHORT_DATETIME_FORMAT" }}