Multiple links for one webinar

go into your event, in the bottom section/Invite Attendess, you should see a registration link and under it Source Tracking Link, click the +Add. 

So create something meaningful to you.  maybe just internal and external. 

We use at least 10 tracking links per event to see where the audience is coming from.  Did they registered from our 1st email deployment or 2nd? from our home page on the website, from the sponsor, from social media.  All depends on what you want to track 🙂