You may have colleagues on your teaching team with whom you've already made arrangements to exchange students for a cooling-off period when needed. if so. ask if they would take the students who didn't earn rewards into their class-room during reward time. Of course. be sure to send classwork and/or a book for silent reading so the students will be of minimum bother. Then. be ready and willing to reciprocate when your fellow teacher needs your assistance. You may decide within your teaching team to coordinate a whole-class reward or incentive program for the entire unit. If so. each of you will take a turn at hosting the reward event while the other(s) sit with those who cannot attend.