Booking calendar shows you when each of the clubrooms/other venues is booked. If you would like to use one of the available spaces, contact the keyholders using a reservation form. The person who you are in contact with will add the reservation to this calendar to inform other bookers.
NOTE: Even if all the spaces are shows all the spaces, it is up to the keyholders to add the reservations to the calendar. Up-to-date information of a space being available is not certainly known before getting a response to a reservation.