You can add a signup page to an event.

This allows people to sign up for the event directly either on the day of the event, e.g. as a ‘walk-in’ or in advance of the event.
If your event has a fixed capacity you can add a Waiting List to the event

Steps

Requirements:

The project that your event belongs to must have at least one Signup Page: How to create a Signup Page for an event’s project

How to add a Signup Page to an event while creating a new event

Select Create in the top menu
Select Event
Choose the project and event category
Complete the form as usual but before you press Save, select a Signup Page (Public Form) in the Signup Page to use for event registration dropdown list.
1. The Signup Page to use for event registration dropdown list will be hidden unless there is a Signup Page that has the event’s project as its destination.
Press save
That’s it. Your event’s Self Check-In page will now include the Event Signup Page for New Guests.

Select My Apps in the top menu
Select Events
You arrive on the Manage Events page
Select the name of the event you want to activate Self Check-in on
Scroll down to the part of the form where you can select a Signup Page in the Signup Page to use for event registration dropdown list.
1. The Signup Page to use for event registration dropdown list will be hidden unless there is a Signup Page that has the event’s project as its destination.
Press save
That’s it. Your event’s Self Check-In page will now include the Event Signup Page for New Guests.