I doubt any “retail” closes, but that’s accurate for mainly all of the holidays except Xmas and Easter. Usually there are some situations in which a visa applicant might not need to get interviewed when renewing his/her visa. Begin to see the U.S. Embassy or Consulate website For additional information. https://american-visa-from-uk93592.pages10.com/american-visa-ds-160-no-further-a-mystery-71258345