Adding logo to registration form

Is there a way to add our logo to the top of the event form? We normally host a lot of our events on our website, but that's only if it's open to the general public. Lately, we've been hosting a lot of smaller committee events where the committee members are inviting their networks. So we've been sharing the unique URLs for those events in our email outreach. But if people don't know our organization yet, there's not really a way to add images to the form or even format the browser so our favicon appears. We aren't having everyone create an account through our portal. Is there some other way we can add any other branding customizations?