This means putting costumes back in the boxes, not leaving anything on the floor, replacing the screen to its original position (along the window-wall), turning off, unplugging, and setting aside the lights, and putting the table back.
Speaking of such things, I have also noticed more and more coffee cups, water bottles and food wrappers left behind in classrooms after everyone leaves. No one is asking you to be cleaners, but a daily reminder to everyone to gather their things and to get rid of what they no longer need is in order. It is a constant battle. Help fight the good fight.