Bunco Night RSVP Website: Tables of Four, Subs, and a Full Room
A bunco night RSVP has to fill tables in multiples of four and keep subs off the score sheet, because a maybe does not make a table that can play.

A bunco night breaks when the headcount is not a multiple of four. The game is played at tables of four, with players moving as the rounds change. Thirteen yeses do not make a fourth table. They make one person sitting out, or a table that cannot start, while everyone else waits on a friend who said maybe. Dice, score sheets, and the little prizes are bought for a full room. A late yes does not create a fourth chair that was never in the house.
You can create a bunco night RSVP that fills tables in sets of four, keeps a sub list that does not count as seated, and closes when the room you set is full.
The room only works in fours
Decide the room before you send the link. Three tables means 12 players. Four tables means 16. Five means 20. That number is your cap, and it has to fit the tables and chairs you actually have, not the number of people you wish would come. Write the math on the page so a guest can see why you are not holding a seat for a vague maybe.
Set a capacity limit at that multiple of four. When the last seat is taken, the form should say the night is full. If your yes count is 12 and you wanted 16, the page should say four seats are still open, not that people may show up and squeeze in. A player who arrives without a seat does not pull a chair from the kitchen and break the rotation.
A maybe is not a seat. If you let maybe count toward 16, you will buy prizes and snacks for people who stay home, and you will still be short a table when the bell rings. Ask for yes or no. If someone is unsure, they belong on the sub list, and they need to know they do not have a score sheet until you promote them.
Partners, subs, and a full table
Bunco does not keep couples together. Say that on the page if your group is new to the game, so nobody RSVPs on the promise they will sit with a spouse all night. Track a plus-one as a named person, not as a ghost. An unnamed partner turns 12 into 13, and 13 does not play. If the night is invite-only, say partners are not included unless the form gives that person their own seat.
Keep two or three subs who can arrive on short notice if a player cancels the day of the game. Tell them the truth: they are not in until you text them a yes. Do not print their name on a score sheet early. If nobody drops, they do not come, and they should not be holding the evening on a guess.
If the night is adults only, say so in the first paragraph and do not leave it to etiquette. An adults-only RSVP is a rule about who the seat is for, not a hint. A teen who was not in the count still takes a chair, a snack, and a prize you did not plan.
Prizes, snacks, and when people walk in
Count prizes from the locked headcount: a bunco winner, most buncos, most wins, a last-place joke prize if your group does that, and a traveling prize if you use one. Buy or make them after the list is a multiple of four, not when invitations go out. The same is true for snacks and drinks you are buying per person. A headcount of 16 is a shopping list. A headcount of about 16 is how you run out of cups or throw food away.
Ask for an arrival window. If you start at 7, a player who walks in at 7:40 holds a whole table. Say the clock time you lock the door for play, and say that a late player may sit out the first round rather than restart the room. Put the address, parking note, and whether you are providing dice or they should bring nothing but themselves.
When the list locks
Close the form early enough to buy prizes and food, and late enough that your regulars have answered. The day you shop is the deadline. After that, a cancellation gets the first sub, in the order you wrote down. A new yes does not jump the sub list, and it does not make the count 17.
Export the list when you lock: table count, named players, subs in order, plus-ones already included or refused, arrival window, anything you still need to buy. A bunco night RSVP is finished when every chair is a multiple of four, every sub knows they are waiting, and you can deal the first round without doing math at the door.