Every accepted invitation carries a silent probability: the person who sent it might not make it. Illness, travel disruption, a family crisis, a miscommunication about dates — the reasons are ordinary, and they arrive without warning. The gap between accepted and arrived has a name in event logistics: attrition. It is predictable in aggregate even when you cannot predict which individuals will drop.
What the Gap Looks Like
For a seated wedding breakfast, experienced caterers and venue coordinators expect a drop-off somewhere between two and five percent of confirmed acceptances. A hundred confirmed guests produces, historically, somewhere between ninety-five and ninety-eight people in the room. That range is not alarming. What it means in practice is that you should not cut the meal count to the bone, because late drop-offs happen after the final number is fixed with the kitchen, and you are paying for those plates either way.
The direction of surprise is almost always downward. Very rarely does someone turn up uninvited and unannounced to a seated, ticketed event. The problem is always attrition, not inflation, which makes the arithmetic more manageable: you are planning a buffer in one direction only.
Where attrition bites hardest is not in the meal count but in the seating plan. A no-show at table three is a gap in the room, a chair that reads as absence rather than space. The fix is mechanical — remove the chair, reset the place settings — but only if someone is watching for it. Appoint a specific person (an usher, a venue coordinator, a trusted friend with a list) to reconcile arrivals against the plan before the room is called and make those small adjustments. Done quietly, in the thirty minutes before guests are seated, it is invisible. Discovered mid-service, it is not.
Day-of drop-offs — the message that arrives at nine in the morning — are a separate category. They are almost impossible to reflect in the kitchen count by that point, but they are entirely possible to handle in the room. The chair comes out. The place card goes away. Nobody who is present notices what is missing.
The useful mental shift is this: the seating plan is drawn for the number you expect, not the number who said yes. Those are different numbers to begin with, and attrition peels back another small layer on the day. Build the plan knowing the room will be slightly smaller than the list, and it will be.