As far from the prespective of an administraor and authority, it does seem a good idea. It would test whether or not everything would work well. However, if you look at the point of the counselors, I think it would not be as good as from that prespective. The counselors are scared and worried about what is happening. Also, if something like that happens again, the counselors might wonder whether it is a drill or an actual emergency. I think i would tell the counselors that there might be one this week. That might be a good midpoint, just not telling them when.