I just got the invite to my (male) cousin's wedding in October and there was no response card included in the envelope. Oversight or something I don't know? The reception card said something at the bottom like "the favor of a reply is requested". I'm confused. There's no RSVP date on the reception card yet it mentions a reply. By all accounts this is going to be a very (very) nice black tie optional wedding so I'm wondering if in certain circles response cards are not done. I've just never been invited to a wedding without getting a response card to send back. How do I reply? Write a letter to the address on the back of the envelope? I don't even know which of my future cousin in law's parents live at that address (they're both listed on the invitation but they're divorced). This must just be a mistake, right?