Halloween for her.
Awesome.
Historically many school shootings happen within a mile or so of an active drill, time after time after time. The drill is NEVER at the site of the shooting, but is close enough to give cover for a larger than usual LEO presence in the area, and splain away a faster that usual (but often ineffectual) response.
If I were a parent of school age children, Id watch for an anti-terrorist drill scheduled for my area and find a damned good reason to keep my kids home that day.
ESPECIALLY if they need to knock a Hillary! scandal off the front pages!