I manage a couple Draper rotating single-layer OHs for local schools. We rebuilt one the other day. After cleaning, we added new frames of comb, bees, new queen, lots of eggs and wet larvae. As we rolled in back inside, the bees became a little agitated. Within a couple hours they were flying around everywhere outside and running all over inside the hive. I suggested to the school that they cover the hive to keep much of the light. They did and soon the bees had calmed down and were behaving normally with no scampering all round inside and out. Is it best to keep them covered until there is a class present who needs to make observations? Then cover again when the class is over?