how does the ides of march relate in wednesday wars

Holling addresses the reader telling the reader to "beware the ides of March," This of course is from Shakespeare's Julius Caesar. Mrs. Baker says that the observation will take place in a week—on the Ides of March. Holling understands the reference as well as the sense of foreboding that the "Ides of March" brings. He is incorporating Shakespeare into his thought process.