You will be given a definition of a task first, then some input of the task.
In this task, you will be given a passage, a question and a list of single-word events identified from the passage. The goal is to point out all events from the given event list that can answer the question. If a question is unanswerable or none of the events answer the question, output should be empty.

Passage: Many workers were advised to operate from home and some companies, such as telecoms firm Reach, temporarily relocated operations to outlying districts, leaving only a skeleton staff for the duration of the six-day meeting. Instead of office workers crowding the sidewalks of Wan Chai's Gloucester Road, groups of police stood ready in case protests turned violent, part of a massive security operation involving 9,000 officers staged for the WTO meeting. Question: What took place before the six-day meeting? Events: ['advised', 'operate', 'relocated', 'leaving', 'meeting', 'crowding', 'stood', 'protests', 'turned', 'operation', 'staged', 'involving']
Output:
advised