Progressive Dinner RSVP Website: Course Seats, Host Kitchens, and a Dietary Line
A progressive dinner RSVP has to lock a seat at every course and a kitchen that can plate that headcount, because a maybe does not hold a seat at the next house.

A progressive dinner breaks when the appetizer house set ten places and thirteen people arrive, or when the main-course host bought for a shellfish-free menu and a guest's allergy shows up at the door. Each course is a different kitchen, a different table, and a different clock. A chair at the first house does not create a chair at the third. A maybe does not hold a seat at the next house.
You can create a progressive dinner RSVP that locks a seat for every course, tells each host who is walking in, and stops when the smallest kitchen is full.
The smallest kitchen sets the cap
Walk the route before you send the link. Write down, for each host, how many people can sit at one time, whether the course is plated or passed, how long that stop lasts, and whether the kitchen can add a chair without moving the meal to the floor. The smallest of those numbers is your cap. Do not average them. A living room that can hold sixteen does not help a dining room that holds eight.
Ask each host what they are cooking and what they are not willing to change. Appetizer, main, and dessert are different jobs. A host who is serving a set menu cannot absorb a last-minute guest the way a potluck can. Put each address, the course, and the time window on the page. People need to know they are moving, not staying for one long meal.
Set a capacity limit on people who will eat every course, unless you have a real plan for someone who joins only one house. When the last seat at the smallest table is taken, the form should say the dinner is full. A plus-one is another seat at every house, not a shadow next to the person you invited.
Diet, severity, and a menu that travels
The same guest will sit in three kitchens. A note that says "vegetarian" on one host's text thread will not reach the other two. Ask once, on the RSVP, and send each host the same list.
Collect a dietary line with severity. Gluten, shellfish, dairy, and nuts are different problems, and a preference is not the same as a reaction. Ask whether a shared pan is enough to make that house unsafe. If a host cannot cook around a severe allergy, say so before that guest accepts a seat they cannot use. Offer a clear no: they skip the dinner, or they skip only the course that cannot be made safe, and only if you have a seat plan for the houses they will still enter.
Ask each host to name the dish, the main allergens, and what they can swap. Write that on the page. Do not let three hosts each assume someone else is covering the guest who does not eat meat.
Plus-ones take a plate at every stop
If you allow a guest, track that plus-one as a separate person with their own name and their own dietary line. "Jordan and guest" is not a headcount a host can plate. The guest needs a seat in the car between houses too. If you cannot add them at every course, the answer is no, not a maybe that the dessert host will squeeze in.
Getting from one house to the next
The gap between courses is part of the event. Ask how people will move: walking, a host's car, or their own car. Collect transportation plans so you know who is driving, who needs a seat, and who cannot climb the stairs at the second house. A ten-minute drive with four cars and one open passenger seat is how someone misses the main course.
Put parking notes for each address on the page. A driveway that holds two cars cannot take the whole guest list. Say where overflow goes, and whether a rideshare can stop on that street. Name a depart time from each house. Hosts need their kitchen back, and the next host is plating on a clock.
If someone cannot do stairs, standing appetizers, or a long gap outside, ask before you assign them a route. One house may be fine and the next may not. Confirm each stop, not just the first.
Tie your RSVP deadline to the earliest host's shopping cutoff. After that, a late yes is a call about a cancellation at every house, not a promise that three kitchens can add a plate. If you want names ready when someone drops, keep them as standbys and tell them they do not have a chair until you write back. A maybe does not hold a seat at the next house.
Export the list the day you lock: name, each course they will attend, dietary line and severity, plus-one if any, ride or driver, and phone. A progressive dinner RSVP is finished when every host has the same headcount, every plate matches what that person can eat, and nobody is standing in a doorway because the car was full.