Skip the plugin step entirely. Create the event in Turnout — title, date, time, location, and an optional capacity limit — then copy the embed snippet from the Embed tab.
In WordPress, open the page where the form should appear. In the Gutenberg editor, add a Custom HTML block and paste the snippet in. In Elementor, drag in an HTML widget and paste it there. In Divi, use a Code module.
Publish the page. The registration form renders where the block sits — no plugin installed, nothing added to the plugin directory, and nothing to update when WordPress ships its next release.