The VAC appointment must be at least one day in advance of the consular appointment.
You will take an VAC appointment after you take the appointment for a U.S. You must take an appointment in advance before visiting the VAC. The visa application call center services will be closed only on Saturdays, Christmas, New Year’s, Holi, and Diwali. One VAC is located in each city where the Embassy or a Consulate is located. US Visa Application Centers (VAC) locations are used by the visa applicants to submit biometric information, including their fingerprints and digital photograph.