Thank you for reaching out about your event! I apologize for any confusion there may be with the location that is appearing. I took a look at your event details and can see what is causing this. It appears the address for your even isn't inserted correctly. The location under your Event Basics does not have the city listed in the right place. Once a valid address is put in, it will appear correctly on both your Registration and Landing Page.
You're very welcome! You are however correct, at this time there is no way to edit the sidebar on your registration page. This information pulls directly from the information in your Event's Basics.