I am getting to this topic late. My first real disaster years ago, was a mad man that went on a shooting spree, between two shopping malls. They called everyone in, including the midnight shift. What I learned was 1) Let the people coming in know where the event is happening, we got techs stuck in traffic jams. 2) do not call in night shift in to early, because once all is over and done with, they (sometime it is one person) are the ones having to clean it all up. 3) If they are going to lock the facility down, know how which doosr they will allow employee in at. 4) It is amazing how a disaster will bring everyone together. Without much words, we had a tech in the ER with emergency release blood, making sure all went well down there. We were our own supplier of blood, but the neighboring blood banks called and offered us all we could use. Because if we had to draw and process it all it would have slowed us down so much.