Hey @usman,
It is possible that there are theme-related issues at play here, which we would unfortunately be unable to help with, but you might be able to get things working as desired here by first heading to Events > Settings > Display in your admin dashboard.
Once on this page, scroll down until you see the Events template option, as shown in this screenshot:

Try out every single different template option there, and then after saving changes take another look at your site. See if the sidebar issues persist or if anything improves!
Let us know what you find 🙂
George