Table/code breaking page and editor

Can't edit the page http://survivalschool.us/survival-training-calendar/

I believe there is something in the table on the page that breaks the editor. It also doesn't work with the theme and all plugins disabled so it doesn't seem to be a conflict with any of those. It doesn't work with the layout builder off either or in a blog post. I have the .htaccess file set to the default with no security or customization.

Also when the editor does happen to load up, clicking the update button results in the error:

This page isn’t working
survivalschool.us didn’t send any data.
ERR_EMPTY_RESPONSE

The page works perfectly fine on another host as seen here:
http://185.56.84.140/~survival/survival-training-calendar/