What do you have selected as your Event Template in Events > Settings > Template? If you have the Default Events Template selected, you're going to need to modify the /wp-content/plugins/the-events-calendar/views/ecp-page-template.php and /wp-content/plugins/the-events-calendar/views/ecp-single-template.php conditionally hiding the sidebars in your theme. You can use this conditional code to help you: https://gist.github.com/jo-snips/2415009
If you are using the Default Page Template or any other theme template option, the plugin is going to use your theme's page.php and single.php template files or another page template file based on what you have selected. Again, you'll need to conditionally hide the sidebars with the code I provided above.
Unfortunately this is about all the guidance I can provide you. Good luck!