Add eventbrite section

index.md

@@ -90,7 +90,25 @@ Read correct lesson meta from esciencecenter-digital-skills/workshop-metadata
 Check DC curriculum
 {% endcomment %}
 
+{% comment %}
+EVENTBRITE
 
+This block includes the Eventbrite registration widget if
+'eventbrite' has been set in the header.  You can delete it if you
+are not using Eventbrite, or leave it in, since it will not be
+displayed if the 'eventbrite' field in the header is not set.
+{% endcomment %}
+{% if eventbrite %}
+<strong>Some adblockers block the registration window. If you do not see the
+  registration box below, please check your adblocker settings.</strong>
+<iframe
+  src="https://www.eventbrite.com/tickets-external?eid={{eventbrite}}&ref=etckt"
+  frameborder="0"
+  width="100%"
+  height="400px"
+  scrolling="auto">
+</iframe>
+{% endif %}
 <h2 id="general">General Information</h2>
 
 {% comment %}