Yes you can – sometimes this can be accomplished quickly with a bit of CSS where the sidebar is simply hidden on those pages where you do not wish it to appear. If you want to give that a whirl, please provide a link to your website so I can determine the best piece of CSS to use for this.
A more ‘complete’ solution might be to use one template (such as your default page template) for events views and another (such as single.php) for single events – depending of course on what templates your theme makes available.
Either of those sound like options you want to explore here?