Once you start working with your supervisory committee, it is very important to keep its members informed of your research progress. Committee members appreciate receiving the occasional note (or e-mail message) explaining where you are and what you are planning to do next. You should also let them know when they are likely to receive the next installment of the work. This is not only courteous, but also keeps your supervisory committee members up to speed and makes meetings more productive.
You should schedule a meeting when you and your supervisor feel ready to share the proposal or drafts of your thesis work with the other members of the committee.
It is generally your responsibility to set up meetings. Ensure that each committee member receives copies of written work at least two weeks before the meeting.