A theory of presentism

Most of us would want to say that it is true that Socrates taught Plato. According to realists about past facts, this is made true by the fact that there is, located in the past, i.e., earlier than now, at least one real event that is the teaching of Plato by Socrates. Presentists, however, in denying that past events and facts exist (on a tenseless reading of 'exist' as already explained) cannot appeal to such facts to make their past-tensed statements true. So what is a presentist to do?