[Plugin: Event Registration] Demo site? Can anyone provide?

Agreed, lack of demo or screenshots (or inability to find them) tempers my interest in checking this out.

Demo site is here, https://demo.wpeventregister.com/

There is a link on the site https://www.wpeventregister.com and there are screenshots in the user guide, slightly outdated on a few of them, but enough to understand. https://wpeventregister.com/instructions/
link to pdf at the end of the article