Smooth Sub Day
When a shortage of subs happened, I was drafted to sub in fifth grade. At the end of the day, in order to participate in ten minutes of reward time, the students had to write on a card one thing they had learned or one thing they had taught someone that day. Also, on the teacher prepared outline of the times and activities of the day, students signed up to be the experts who helped me understand the routine and assisted in calling on class members and actually did instruction.
Everyone was alert and eager to contribute any piece of knowledge that they might have. Every spare minute was filled with someone writing knowledge on the board. The bonus was that there were absolutely no behavior problems! It was the best day of teaching since I stopped teaching first grade!