Exam CBAP topic 1 question 118 discussion

You are the business analyst for a large project that will create new software for the entire organization. This new software will affect all of the administrative assistants in the organization schedule meetings, reserve facilities, and share calendars. There are approximately 2,400 administrative assistants in your organization and not all of these people can attend requirements gathering workshops.
What approach can you use to manage and gather requirements from these 2,400 administrative assistants?