Vilem Flusser speaks to the difference between a happening and an event, between, linearity and all-at-once-ness. The event wants to be singular to have cause and effect, things happen for a reason. In happenings everything is a result of chance, an accident, an accident that becomes necessary. The world of events are rationally explained, the world of happenings, well, just happen, because it is the world happening.
As we live in the world of events, there are things that happen outside our model calculations, and these things we think of as risks that we did not capture, that fell outside of our model calculations. We simply think we need a new model.
These notions of happenings and events are very distinct ways to understand our consciousness and how it shapes the way we go about making the world and reading it.