Sure, if you're looking at the probability of that specific event occurring.
But if you want to generalize about kinds of events, rather than a single specific one, it's useful to use past events as sample data to estimate probabilities of similar events occurring in the future (provided, of course, that you have defined meaningful categories for entities and events.)
But if you want to generalize about kinds of events, rather than a single specific one, it's useful to use past events as sample data to estimate probabilities of similar events occurring in the future (provided, of course, that you have defined meaningful categories for entities and events.)