Create Rsvp

Creates an RSVP.

The event's registration.initialType must be RSVP. Events created with TICKETING registration can't accept RSVPs, and because initialType is immutable, changing registration.type later doesn't make them eligible.

To create an RSVP with multiple guests, specify the additionalGuestDetails.guestCount and additionalGuestDetails.guestNames fields.

Before creating an RSVP, retrieve the event's registration form by calling Get Event with fields: ["FORM"]. Build form.inputValues from event.form.controls[].inputs, using each input's name, mandatory flag, and predefined options. Unrecognized input names, missing mandatory values for YES responses, and values outside predefined options cause an INVALID_FORM_RESPONSE error.