So, let's take this from the beginning:

There WAS a Sandy Hook elementary school? Yes?

There were 600 some students who attended it?

But most of the students actually weren't there that day. So, how exactly did that work? They sent home slips to all the parents saying "don't send your kid to school tomorrow unless you want to be part of our fun false flag activities" (?

You're talking about around 1200 parents. Not counting siblings. From a neighborhood school. In a small town. How in the hell would you arrange that and keep it a secret? I have to assume you have never had a kid in an suburban American elementary school but it would take about 45 minutes for every mother involved to figure out what was going on. They would have figured it out the night before or whenever the message came out not to go to school that day. Are all these people imaginary? Actors? In on the conspiracy? I mean come on!