Hi Anna,
Our events pages do not have a sidebar by default, so this is likely coming from your theme. I’d recommend taking a look at this article, which has some information on how you can adjust the settings for the events page templates. Alternatively, you could hide the sidebar with CSS.
If you need further assistance with this, please post this question in our Events Calendar PRO forum. We use the Pre-Sales forum to answer questions about the features of our premium plugins for those interested in purchasing them.
If you have not purchased one of our premium plugins, you can post in our community forum on wordpress.org, which we review weekly to check for bug reports. If you need more in-depth support, you will need to purchase a license.
Our knowledgebase is a great place to start looking for answers. You can also search our premium forums to see if another user has posted about a similar issue.