Cool! if i'm planning on Enrolling on Arrival at JFK do I still need to book an interview? I heard that you must schedule an interview within 30 days of confirmation and have it within now 485 days of that approval?

Would I have to schedule an interview for the 10th December for example then when I land at JFK on the 22nd November tell them I had an appointment booked but here I am now? Basically I don't want to lose the $100 on the presumption that I can just show up to EoA without booming an appointment and them cancelling my application.