Hi!
So is the problem basically that you need a sidebar within events pages? If so there are potentially two ways you might go about this.
One is to change the template you are using (via the Events → Settings → Display admin screen) to one which contains a sidebar in the correct place.
The second is to customize and override the Default Events Template (or create a new template from scratch) and add the sidebar in the desired location.
A great starting point if you choose the second approach is our Themer’s Guide which covers how to safely override and customize our templates.
I hope that helps 🙂