You can get the Self Registration link for an event and share it with new people whom you want to register for the event.
Take Note:
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
Steps
Go to the event page,
for example, by clicking Home in the top menu and finding your event within the Events box in the top right corner of the page
On the event page is a box called Self Registration on the left side
If the box does not appear but you expect it to appear, click Edit Event and check that a Self Registration form has been added to the event; and then click save.