You cheapos. When I throw a party I make sure I have enough booze and food for at least three times the people I've invited - just in case they bring friends, room mates, lovers, pets, elephants, fuck - whatever the hell they want. Therefore, I don't have to worry about whether someone shows up or not. It's a party - act like it. I thought RSVP was only if you were coming, would be courteous to let them know if you aren't going though too. This is why I always say to let me know if you are _not_ coming as well. When I phrase this I get a few more responses. I think with important events like weddings people are more considerate (maybe I'm wrong). But for just a get together, I tag each person down by phone. My closest friends let me know, the other people "get back to me" which usually means they dont want to come and can't think of an excuse. Whenever I have invited foreigners, especially females, they always say they will come but almost never show because they overbook their weekends I'm sure. Americans seem to be more reliable once you are able to get a commitment of some sort out of them. In any case, unless it is a formal event with a large amount of place settings like a wedding where I am paying per seat, I have enough booze and snacks to get a small army drunk, so it really doesn't matter. The only thing I worry about is that not enough people will show up.