Chisholm thought that in some cases it makes sense to speak of the location at which a state of affairs occurs. Suppose John walks in Chicago at a certain time. Then Chisholm would be willing to say that the state of affairs of John’s walking occurs in Chicago and at that time. Furthermore, some states of affairs entail certain properties. The state of affairs of John’s walking entails the property of walking because (i) if the state of affairs occurs, then something has the property of walking, and furthermore, whoever accepts the state of affairs believes that something has the property. This gives Chisholm the ammunition he needs to explain what an event is and thereby to effect another ontological reduction.