Response: The invitations should have included RSVP cards. If they didnt, then you will need to guess at the quantities. If you feel that this could get out of hand, you might plan on serving only a limited amount of non-perishible food, such as hors doeuvres, cheese and crackers, etc. rather than running out an entree or having to throw out food that was not consumed but that sat a room temperature too long.
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