The forecast at Wednesday's meeting says forty percent Saturday. By Thursday it is sixty. Somebody says let's just watch it, and everyone agrees, and now it is seven in the morning on Saturday with a truck full of tables and no decision.
Weather contingency for an outdoor school carnival is not a forecast problem. It is a decision-rights problem, and you solve it weeks earlier than you think.
Write the indoor plan before you need it
The indoor version is not the outdoor version squeezed into a gym. It is a smaller event, and you decide the cuts now while nobody is stressed.
Walk the gym and the cafeteria with a tape measure and figure out how many booths actually fit with walking lanes. It is usually about half to two thirds of what you had planned outside. Rank every booth from one to whatever, and the plan is simply that everything below the cut line does not run.
Cut in this order: anything needing throwing distance, anything with water, anything using a pool or a large footprint, then anything loud. Keep the tabletop games. A tabletop raffle wheel on a stand at roughly ten by fifteen inches, a wooden bean bag toss, ring toss on a table. These transfer indoors without changing a thing.
Post the indoor map next to the outdoor map in the same folder. Both should be printed and in the setup lead's hands, not on somebody's phone.
What fails in wind
Wind is the underrated one, because it does not cancel anything and it ruins everything anyway. Fifteen miles an hour is enough.
- Paper signage taped to tables. It flips, tears at the tape line, and lands in the grass.
- Tablecloths, which become sails and take the prize bins with them.
- Anything inflatable. A thirty six inch duck pond pool with an inch of water in it will still shift, and a twelve inch inflatable globe is simply gone.
- Foam game pieces. Four inch foam footballs do not fly where a kid aims them in a crosswind, which makes a booth feel broken.
- Poly-satin award ribbons at eight and a half inches long, which tangle and blow off the prize table in a gust.
- Latex balloons, which is a safety issue and not just a tidiness one. Popped balloon fragments are a choking hazard for children under three, and outdoors they end up on the ground where toddlers find them. Skip latex outdoors entirely and use foil or paper decor.
Fixes are cheap. Clamp signs to trifold boards rather than taping them flat. Binder clip tablecloths at every corner. Weight every bin with something heavy at the bottom. Move light game pieces to heavier alternatives, like five inch vinyl bean bags at about three and a half ounces each, or three and a half inch plastic softballs.
What fails in rain
Paper is the whole answer. Signage, ticket rolls, coloring books, activity pads, crayons, notepads, and anything printed on cardstock. All of it is finished after ten minutes of steady drizzle.
Chalk boundary lines wash out immediately, so if rain is even possible use tape indoors or cones outdoors instead.
Two things hold up well. Hard plastic and vinyl game pieces do not care about water at all, which is why cane rack rings, vinyl ducks, and plastic balls stay in rotation. And adhesive event bands are made waterproof and tear resistant at three quarters of an inch wide by ten inches long, so your admission control survives a wet morning even when the ticket table does not.
Keep prize tubs closed and off the ground the entire event, rain or not. A lid is the cheapest insurance on the whole site.
The call: make it at a fixed hour, by one person
Name the decision maker in writing at the first meeting. One person, plus one named backup. Not the committee.
Set two checkpoints. The first is twenty four hours out, and that call is only about setup: outdoor, indoor, or hybrid. The second is three hours before doors, and that call is only go or postpone. Splitting it this way stops the endless refreshing of radar, because everyone knows exactly when the answer arrives.
Write the announcement text ahead of time with blanks. Three versions: moving indoors, delayed start, postponed to the rain date. When the moment comes you fill in a blank and send, instead of drafting a message while forty volunteers text you.
And the thing to stop doing: stop holding the outdoor plan open past the twenty four hour checkpoint because the forecast might improve. Late pivots cost you volunteers, because people who showed up expecting to haul tables outside and then stand around for ninety minutes do not come back next year.
Weatherproof gear is worth stocking once. Look at carnival supplies for wristbands and durable game pieces, games and puzzles for tabletop booths that move indoors cleanly, and party supplies for decor that does not depend on latex. Ten percent comes off with TODAY at checkout, one order only.