Quorum requirement governs committee meetings and adjourned meetings; membership threshold may be modified for future meetings. A committee meeting requires a quorum of members representing a minimum share of voting rights present in person or by audio-visual means; the committee may modify the voting-rights threshold for future meetings. If a meeting cannot proceed for want of quorum, it automatically adjourns to the same time and place on the next day unless the committee has decided otherwise, and the adjourned meeting is quorate with the members who attend that adjourned session.