Conference marketing in a Competitive Marketplace One of the main differences b

Conference marketing in a Competitive Marketplace
One of the main differences between corporate events and association events is the guaranteed attendee base. Typically, in corporate events, there is a set group of people who must attend (such as a sales meeting or corporate training). Association meetings are not required and, therefore, the organization advertises to the relevant professional community at large to secure attendees. Therefore, marketing is extremely important for these types of events.
The Engineering Association of America is a nonprofit association of members who are professional engineers. This association is the longest running association focused in engineering, but has recently faced sharp competition over the past decade from conferences focusing on specific segments of engineering (mechanical, electrical, ets.) and niche conferences (Women in Engineering, etc). Due to this competition, conference attendance has decreased by over 35 percent in the past five years. You have just been hired as the new Director of
Marketing.
Question
For this particular group, which social media outlets would you focus on? Why?