400 guests, no paper — how to count wedding guests

Every big wedding has four numbers, and they disagree. Your mother’s number is people she would like to see. Your partner’s mother’s number is the same, from the other side. The hall’s number is chairs. The list on the kitchen table is invitations — households, really, because “the Yılmaz family” is one line and six people. None of these is the number the kitchen needs, which is people who said yes, per celebration, on the day the number closed.

This is the arithmetic that turns the four into one. It is not complicated, but it has to be done in this order, and most lists do it in the other one.

An invitation goes to a household; a hall counts chairs. A hundred and twenty invitations can be three hundred people. So the unit of your list is a person, and the household is a grouping on top of it — “Aunt Nur and family” is four lines under one heading, not one line with a four in the margin.

Keeping people separate matters most where a household splits between celebrations. At a Turkish wedding the kına gecesi, the henna night, asks only the women of a household; at an Indian wedding the sangeet, the music night, may be the whole household while the ceremony is not. One household then gives more than one answer, and a list built on households cannot hold that. A list built on people can. The diary’s guest list works this way: people in households, one line each, imported from Excel or your contacts — and when it is time to send, each person gets a link of their own.

The plus-one question costs more conversations than any other, because it is decided per name. Decide it once instead.

Count children as people from the first day and mark them as children. The hall will count them its own way — as a plate, as half a plate, or not at all under a certain age — and a list that knows which lines are children can answer any of those in a minute. A list that left them out cannot answer at all.

Two more numbers the hall will ask for: how many children need a high chair, and how many children are infants who need nothing but a quiet room. Two numbers, per celebration, kept beside the head count.

The hall names a date after which the number is final — usually a week to ten days before each celebration. That is the hall’s deadline. Yours is three days earlier: the last day you chase everyone who has not answered, while the number can still change.

Paper invitations are counted twice: once when they go out and once when the reply cards come back, by hand, into a spreadsheet. A link per guest is counted once. Every guest opens their own invitation, in their own language, with only their celebrations on it, and answers there — per celebration, without an account, after confirming the last four digits of the mobile number you have for them or their household, where you have one. The answer lands in your list, per person, and the head count per celebration is a number you read, not a number you make.

The mother who wants paper still gets paper: her whole invitation printed, with her own QR code, opening the same link. The arithmetic does not change. The counting does.