Hey @Bizdoktor,
Thanks for reaching out.
We unfortunately cannot help with custom coding, as elaborated upon in our support policy. Please read that support policy here → https://theeventscalendar.com/knowledgebase/what-support-is-provided-for-license-holders/
Also, we do not make the su_button shortcode, so I am not quite sure what is happening here or what you’re trying to do, or why errors keep arising.
With these things in mind, then, I would recommend the following courses of action:
1. First, reach out to the folks who make the su_button shortcode you are trying to add on your site.
2. Next, if you need to do some extensive code customizing here, check out this collection of customization resources we have compiled that might be helpful → http://theeventscalendar.com/customizations
Best of luck with your customizations! 😀
George