We had something like that about a month ago. Something happened that scared most of the people near the front badly enough that they wouldn't talk or come out. Fortunately we were in a safe place. It was a couple hours before one of our adults checked and realized that all the usual people were gone. Rose held the front for several days (and was exhausted) until we could get with one of our friends who's a therapist. The friend talked us thru what happened that evening until we got enough communication going to realize what scared everybody and then helped us work thru the experience.