How to send out a registration link:
On the dashboard, hit the list share button.
Click the "Share Check-in Link" menu option.
Toggle the "Allow New Registration" option.
Open the check-in link in a new tab, you will see a register button on the page.
Advanced:
You can add survey questions to the registration form by adding survey questions to the list from the list detail page.
Survey questions automatically show up on the self check-in page and the registration form.
Screenshots:
