add Eventbrite code

index.md

@@ -17,7 +17,7 @@ instructor: ["Kristina Hettne", "Bjørn Bartholdy", "Eduard Klapwijk", "Paolo Ro
 helper: ["Kristina Hettne", "Bjørn Bartholdy", "Eduard Klapwijk", "Paolo Rossini", "Agnes Schneider"]     # boxed, comma-separated list of helpers' names, like ["Marlyn Wescoff", "Fran Bilas", "Ruth Lichterman"]
 email: ["[email protected]"]    # boxed, comma-separated list of contact email addresses for the host, lead instructor, or whoever else is handling questions, like ["[email protected]", "[email protected]", "[email protected]"]
 collaborative_notes:  # optional: URL for the workshop collaborative notes, e.g. an Etherpad or Google Docs document (e.g., https://pad.carpentries.org/2015-01-01-euphoria)
-eventbrite:           # optional: alphanumeric key for Eventbrite registration, e.g., "1234567890AB" (if Eventbrite is being used)
+eventbrite: "768250837937"          # optional: alphanumeric key for Eventbrite registration, e.g., "1234567890AB" (if Eventbrite is being used)
 ---
 
 {% comment %} See instructions in the comments below for how to edit specific sections of this workshop template. {% endcomment %}