So our RSVPs are due tomorrow and in which I expected we are waiting for about 15-20 cards back (will give till mid next week). Our numbers are due next Friday so I am not as worried as I probably should be. We have had the so and so plus 4 kids that weren't invited but let it slide as our count is lower than we had expected. Anyways how many extra have you added into your final number to your venue/caterer?