Watercolor Night RSVP Website: Sheet Counts, a Table Cap, and a Wash Line
A watercolor night RSVP has to lock a sheet and a table before the first wash, because a maybe does not hold a sheet.

A watercolor night breaks when twelve tables are set and eighteen people arrive expecting a sheet, or when the paper order was built for twelve and three of those names were still a maybe on Friday. Sheets, the table each painter uses, and the wash you will actually stop at are set before the first brush. The host does not open a thirteenth sheet because a neighbor decided to paint after the page closed. This is a quiet watercolor night with pans, water, and paper, not a sip-and-paint party with a matching canvas and a drink in the other hand. A maybe does not hold a sheet.
You can create a watercolor night RSVP that fills the tables you will actually set, records who is painting and who is only watching, and stops when those seats are full.
Count the painters the tables can hold
Walk the room before you send the link. Write down how many tables have a board, a water jar, and a lamp, how many cold-press sheets you cut, and whether a spare sheet is a replacement for a buckled page or a thirteenth study. If twelve tables can each take one painter, that number is your cap: twelve painters, not a crowd sharing one pan set.
A watercolor station is one sheet, one table, and one pan set. You lay a wash, let it dry, and stop at the study you named. There is no instructor painting a sunset for the room to copy, no wine flight, no canvas on an easel, and no shared brush cup that becomes someone else's painting. Ask whether a person who will not paint can sit away from the jars, and whether that person still counts toward the number the room can hold. Pick one rule and write it on the page. Watchers stay off the sheet. They do not take a turn with someone else's brush or start a second page just to try a color.
Ask the last time you can change the paper order without paying for sheets you cannot return. If the shop locks the order on Tuesday for a Friday night, that Tuesday is your lock. Write the finish too: one sheet, one named painter, brushes rinsed when the study has reached the stage you named. A thirteenth table "if a card table turns up" is not a plan.
Set a capacity limit on painting seats, not on everyone who was invited to sit nearby. When the twelfth seat is taken, the form should say the night is full. If the sheets are already cut, a late painter is not at these tables.
The wash line is a study, not a vibe
Name the study you will finish and stop there. A clear line is one sheet, two washes, and a stop at "dry enough to carry flat," not a finished illustration and not a stack of tests. Painting until the pan is empty is a different night, and you will not finish it in this block of time. Sip-and-paint, with a guided canvas and a drink, is a different party. So is cyanotype, with coated paper and sunlight, and so is a resin pour.
Put that study on the form as the point you will stop, not a vague "until it looks done." If the night ends when the second wash is dry and the jar is emptied, that is the line. People who want to keep adding layers until the paper curls will still be painting when the room has to close. You need a yes to this sheet, this table, and this wash line before you hand out pans.
Who sits where, and whether a plus-one gets paper
Nights go wrong when the chair is a surprise. Watercolor means sitting still, reaching a water jar, and working in light that does not throw a shadow across the sheet. Ask whether someone needs an end table, a left-hand setup, or a seat away from a draft that dries a wash too fast. A guest who cannot sit through the block does not get assigned a sheet they will abandon wet.
Collect seating preferences so you know who needs the window and who wants a quieter corner. Track plus-ones separately before you count sheets: a guest who will paint needs their own sheet and their own seat, and a guest who will only watch does not take a pan. Write what happens if someone misses the start: their sheet goes to a standby already in the room, or it stays in the folder and the late guest does not begin a second study.
The moment the sheets are locked
The meeting point is the room you named, not "the studio" with no table marked. Put your phone on the page. A message in the group chat is not a table assignment. You match names to sheets.
Tie the deadline to the paper order, the day the painter count cannot change. After that, a late yes is a call about a cancellation, not a promise of another sheet. If you want names ready when a painter drops, keep them as standbys and tell them they do not have paper until you write back. A maybe does not hold a sheet.
Export the list the morning you lock: attending or not, which table, seating note, plus-one note, and phone. A watercolor RSVP is finished when every table has one named painter, the wash line is the study you will actually stop at, and a late guest knows whether they are painting or watching from the chair.