How about asking children to make a cafe at home. They could designate a space, maybe outdoors, come up with a name, a sign, a decorated menu with prices, act as waiting staff (dressing up), make a little notebook to take orders, could decide on opening hours, make hygiene posters etc etc thus could be ongoing. Say a week to set it up then run it 2 sessions a day. Maths/ literacy/drama/ science all covered.