My mother and I planned a great jack-and jill shower for my sister and her fiance (who are getting married right before me). They provided us with the addresses for some 80 guests off their wedding guest list. We got about 20 rsvp's that said they couldn't attend, so we expected about 60 people. Only one couple showed up. Two people!! Since some of these no show invitees already RSVP'd that they would be attending the wedding, I know we had good addresses. My sis and soon to be bro-in-law were so hurt and embarrassed, and I'm livid on their behalf as well as having the feeling of a HUGE hole in my wallet. Has this happened to anyone and what, if anything, can be done? I so hope these people don't treat the wedding as rudely as the shower.