We don't practice laundry day where I come from but I know it is a usual practice in the states. I really don't know what the laundry day entails but from my own point of view, I will say it's a day they celebrate the concept of laundry. And if it is to be done effectively, it should be a public holiday.
The participation link:
@mariannewest/day-1944-5-minute-freewrite-friday-prompt-laundry-day