Congrats this is awesome!
Even doing the cutting/pasting from the wiki page to set up an event can sometimes be harrowing, so kudos for sticking with that part.

Some of wiki syntax is relatively arcane and even custom templated MediaWiki business. Here’s a link that explains most of the portion you had some difficulty with: https://indieweb.org/wikifying#How_to_Join_the_IndieWeb_Wiki