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.
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.