This property describes the active or passive presence of a persistent item in an E5 Event without implying any specific role.
It connects the history of a thing with the E53 Place and E50 Date of an event. For example, an object may be the desk, now in a museum on which a treaty was signed. The presence of an immaterial thing implies the presence of at least one of its carriers.
Deckchair 42 (E19) was present at The sinking of the Titanic (E5)