The Self Check-in Form is the form that event guests complete when they use the Self Check-in Page is called the Self Check-in Form.
The form is a survey (How to design a Self Check-in Form)
The form is assigned to each event individually from the Edit Event page (How to assign the form to an event)
The form can be as brief or extensive as you want it to be. There is no limit on the number of questions and sections that it can have.