Definition: In this task, a passage will be given and the goal is to identify an event from the passage. An event is defined as a single word representing something that happened, is happening, or may happen. An event can be factual or hypothetical, positive or negative, certain or uncertain. While most events are based on verbs, an event can also be based on a noun (ex. storm, snow, rainfall) or a copula verb (is, was, been, etc.). The event must not be a pronoun or an adjective. For noun events with multiple words, use the last word in the phrase as event.
Input: Passage: At the Harry Truman Library in Independence, the three foreign ministers of Bronislaw Geremek of Poland, Janos Martonyi of Hungary and Jan Kavan of the Czech Republic signed formal documents of accession. In speeches before the signing ceremony, the ministers said their countries saw NATO membership as an assurance of security and recognition of their rightful place in Europe.

signed