You may want to add smart codes or affiliate tracking to your registration URLs so you know where your viewers are accessing the registration link from. To set up, you simply need to add /st/exampletrackingtext to the end of your registration URL or your vanity URL if you are using one.
Copy your registration URL from the Share your event box, under the Overview tab.
For example, you may create one to insert in your email campaign and one to insert into your website.
Once configured, you will be able to access a Smart Code report under the Reporting tab and Audience page. In this example, the report is displaying how many people registered by clicking the link from the email campaign vs. the website.
You can create as many smart code registration links as are needed.