Nurseries could find it useful
Put a detector near every exit, and in each room and you could see an overview of where every child at the nursery at any given moment. Sew the tag into a piece of clothing to make sure it doesn't get lost (depending on size).
Would make for a straightforward system and could even be set up to set off alarms if a child goes beyond a certain boundary within certain times.
Or a restaurant, have a delivery tray, unique to each table with a tag on it, when the tag exits the kitchen you can use a smart display in the table, or even a flashing light to indicate that the food is on the way.
So many ideas.......