White Elephant RSVP Website: A Gift Cap, a Full Circle, and No Empty Chair
A white elephant RSVP has to match wrapped gifts to people in the room, because one missing guest leaves a gift unopened and one extra guest cannot take a turn.

A white elephant game only works when the number of wrapped gifts equals the number of people sitting in the circle. One person who said yes and does not show up leaves a gift with nobody to open it, or forces you to play their turn and then explain the joke to them later. One person who arrives without a gift sits through a game they cannot join, or you scramble for a spare that blows the price cap. The RSVP is how you keep those two numbers the same.
You can create a white elephant RSVP that asks for a yes only from people who will bring one wrapped gift and stay for the game. A maybe does not buy a present.
Players and gifts are the same list
Cap the game at a number that can finish. Ten people, with three steals allowed, is a long half hour. Twenty people is an hour and a half if everyone performs. If your room only has fourteen chairs in a circle the rest of the party can see, fourteen is the cap. Put that number on the form and close it when it fills. The capacity limit matters here more than at a buffet, because an extra guest cannot "just watch" without leaving someone out of a round or stretching the rules.
Ask each yes to confirm three things: they will bring one wrapped gift, they will be there before the game starts, and they are playing rather than dropping a gift and leaving. If partners are both invited, each person who plays brings a gift. A couple that brings one gift is one player. Write that on the page so you do not get one box for two seats.
Set a start time for the game that is later than the door time, and say gifts go on the table as people walk in, not after the first steal. A player who walks in at turn four with a gift still in the car breaks the count you already announced.
Price cap, steal limit, and what the gift is allowed to be
Publish a ceiling and, if you want, a floor. "About twenty dollars" becomes a ten-dollar gag next to an eighty-dollar blanket, and the person who followed the number feels foolish. Use a range you mean: under $25, nothing under $15, receipts not required but the cap is. Say whether gift cards count, and whether alcohol counts. A bottle can be a fine gift at a home party and a bad one at a school or an office.
Write the steal rules in the same place as the cap. How many times a gift can be stolen, whether the last player can swap, and whether a gift can be stolen back immediately. People arrive with house rules from other years. If you do not pick one set, the first steal becomes a debate. Put the rules on the RSVP so the argument happens before anyone has bought the gift.
One gift, wrapped, no label that gives it away — the name tag, if you use one, says who brought it only if you want that, and most games should not
Inside the price range — gag gifts are fine only if you said gag gifts are the point
Appropriate to the room — if children are in the circle, say no adult jokes; if it is an office, say no gifts you would not open in front of your manager
If this game sits inside a larger party, keep the lists separate. Dinner guests who are not playing belong on the holiday party RSVP. Players belong here. A single "I'll be there" does not tell you who shopped.
Offices have a smaller sense of humor
A home game can survive a foolish gift. A workplace game can ruin a Monday. If you are hosting at the office, read the office party notes and then be stricter than the home version: a hard cap, no alcohol unless the company already said yes, and an explicit line that gifts stay work-appropriate. Do not make attendance at the game look mandatory if the party is officially optional. People should be able to come to the lunch and skip the circle.
Kids, no-shows, and the spare gift
Decide before you invite anyone whether children play. If they do, they each need a gift inside the same cap or inside a lower cap you publish, and the humor rule changes. If they do not, say they are not in the circle so a parent does not wrap something that morning out of guilt. A child who wants a turn after the third steal is a rules problem you already chose not to have.
Ask for a cancel-by time that is early enough for you to tell the group the count dropped, or early enough that you can pull one gift out of the pile if you were the spare. Do not buy a secret extra gift "just in case" and then throw it in when the count is already even. That recreates the mismatch.
The day before, export player names and a column for gift received at the door. If you are short a gift when the game is supposed to start, wait or drop the last arrival from the circle. Do not invent a turn. A white elephant RSVP is finished when every chair in the circle has a person who is coming and a wrapped gift that fits the cap and the rules. The snacks are a separate count.