That’s how pricing already works. I would bet summer flea market days cost more, due to the higher probability of more customers, due to the higher probability

That’s how pricing already works. I would bet summer flea market days cost more, due to the higher probability of more customers, due to the higher probability of good weather days. Airlines/hotels/rental cars/theme parks charge more for days where demand is anticipated to be higher. Any expiring good works this way.