People usually take it in turns to open and close the silence. There is no formal leadership or set formula. Some might not want to lead and that is fine.
Esssential administrative work, arranging a venue, publicity, responding to enquiries and so on is usually, but not necessarily, done by the Meeting First and Second Contacts. (We require two contact persons for registration). These are appointed by the meeting.
However, each meeting will make their own organisational arrangements.
See the ‘Start a Meeting’ page for more information and resources about Meetings