Add guests to the event. By default, guests are added with the status "Going" (approved) and receive one ticket of the default ticket type. Use the ticket or tickets parameter to specify custom ticket assignments. Get available ticket types using /v1/events/ticket-types/list. Use approval_status to add guests as pending approval or on the waitlist instead of immediately approved. Use registration_answers on each guest to record answers to the event's registration questions — question IDs come from the registration_questions field of Get Event.