A scheduled interview is a date to attend, not a decision. The officer can issue, request more, or refuse. The official description speaks in weeks, and that is a description rather than a guarantee. Give notice against an issued visa and a planned admission, not against an appointment slip.
Building slack into a household calendar
Choose an intended entry date within each person’s immigrant-visa validity. If the family travels separately, confirm that the principal enters before or with derivative family members and that later travellers still have usable documents. Arrange shipping, schooling and any employment start around the admission actually permitted, with a fallback for delay. An enquiry does not suspend a stated response or document-validity deadline.
A valid booklet permits a person to seek travel, but a pending Gold Card matter does not itself authorize US admission or productive work. Rank the household commitments by how reversible each one is, and hold the irreversible ones, such as formal notice on a lease, until after admission is actually confirmed rather than keyed to the interview date itself. A confirmed entry, not a completed interview, is the checkpoint that should trigger any step that cannot be undone. Build a buffer between the earliest plausible entry date and any notice deadline, since that gap absorbs a request for further review or a short administrative delay without forcing a rushed move.