For example, the planning committee should be constructed before contracting the facilities, developing the budget, planning the program, or arranging for meals. This is important, because the planning committee needs to be a player in the decision-making processes that are involved in the other four steps. Committees are composed of volunteers. Most volunteers also have jobs and professional and personal lives, and aren't able to devote their full attention to a volunteer role. Sometimes, however, more is less.
Large groups can be unwieldy and unproductive.
Having too many people can cripple some committees. The important thing is to know your volunteers, especially the committee chairs, and to respect their wishes and leadership styles. Construct committees with a cross-section of personality types and leadership styles. Each committee needs an assortment of Thinkers, Doers, Dreamers, and Watchers. The Thinkers will envision the details.