The committee has authority to plan all of its business. In the absence of any explicit decision by the committee, the chair is also empowered in his administrative role to give instruction.
As a matter of course, I prepare a calendar of the committee's program of activity that is distributed to all members. If ever there's an activity planned or proposed for a date and there is no decision by the committee or instruction from the chair, then it says “not confirmed” at the top, so it's within the committee's power to determine the schedule of its own activities.
I hope that answers your question, sir.