Hey @moink, just checking in with @jack5253's reply, was this helpful? If so, let us know what was helpful within their reply, and don't forget to click the 'accept as solution' button.
Otherwise, I did also want to point out that you can customize the invite email templates that webinar hosts can copy after creating a webinar, and send to their potential attendees for registering for the webinar. More info within the Knowledge Base on Customizing webinar invite email templates. I also wanted to note that you can also customize other webinar templates and webinar branding.
Let me know if this was helpful!