When adding a description of your event, you can add a URL and make it a link using HTML.
example: www.mo-va.org isn’t a clickable link.
www.mo-va.org is.
The difference is the clickable link was added using the HTML
<a href="http://www.mo-va.org">www.mo-va.org</a>
You can use this code to help you make your URL a clickable link.