You can get the Self Registration link for an event and share it with new people whom you want to register for the event.
...
There are two Self Registration links on an event page:
Registration only: when people use this link, they:
1. complete your registration form
2. arrive on a Thank You page
Registration and Self Check-In: when people use this link, they:
1. complete your registration form
2. arrive on a Thank You page
3. after 5 seconds they are automatically redirected to the event’s Self Check-In page
Important distinctions
Self Registration is different to Self Check-In
Self Registration = create a new contact for the person in your project + add the person to your event as a guest
Self Check-In = let a guest record their own attendance at your event
...