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Summary: Keep an eye on your friends and who is going to be coming to the party and then ask them who they've invited to the party, pretty soon you'll get a good count of how many people are going to be showing up. Learn how to throw an Anti-Valentine's Day party from a professional party planner in this free events video.
"Now we've already got the invitations taken care of but since this, you're not going to be getting back any RSVPs because you didn't send any out, any cards, so just keep in mind and try to keep an eye on your friends and who is going to be coming to the party, and then ask them who they've invited to the party, and pretty soon you'll get a pretty good count of how many people are going to be showing up. But you'll need to take that count and a good rule of thumb for a party is like this, is to double the amount of people that have confirmed, so anyone that has said, "Hey, I'm coming, I'm bringing two friends." So there's three people, and you're going to want to count them as six people instead of just the three, and that way it will give you a good idea of how many drinks to have, and how many plates and napkins and cups, and how much food, so if you plan that way, then it will be great."
eHow Article: Anti-Valentine's Day Party: People Coming