you're stretching the definition of "event" pretty far there. if you're not referring to an atomic-clock-precise instant in time, you're going to need to elaborate as to what your definition of an "event" is and explain why location/culture/politics are important.

at any rate, if you even want to have a hope of keeping track of any of that stuff, you're going to need a rigorous and atomically-precise physical standard to actually map it all to. look at the tz database. it's a set of mappings that ultimately rely on such a standard of atomic-backed time.