All of that said, being invited to a wedding is an honour, so you should treat it like one. As someone who recently got married, I've seen all types of easily avoidable RSVP mistakes. So here's how you can not be that person who makes things more difficult for the already stressed-out couple. Then again, if you can't make it, whether it's for financial or personal reasons, it's your prerogative to say no, politely and on-time