No you don't HAVE too, but they are highly encouraged. Don't be boring. :/ If you don't want to wear a costume during the ceremony there are bathrooms you can use to change into your costume for the reception.
Yes you do, if you chose not to RSVP and you plan on attending please bring your own chair and sandwich.
Yes, we will have an unplugged ceremony- we want to see your faces not your devices. Plus, we have an amazing photographer.