In quantum mechanics, the term "zero event" is not a standard or widely recognized concept. It does not have a specific meaning or definition within the framework of quantum mechanics. It is possible that you might be referring to a specific term or concept that has been used in a particular context or theory, but without further information, it is difficult to provide a more accurate explanation.
If you can provide additional details or clarify the context in which you encountered the term "zero event," I would be happy to help you understand it better or provide information related to that context.