If you haven't gotten your first jab, go right now to the Instituto Tecnológico. Short lines, lots of chairs, English speakers, VERY organized. Bring a copy of vaccine registration, CRUP, and IMN card front and back. Also proof of residency - we are renters and used a TelMex bill in our landlord's name. Open until 4 pm. It took us about an hour start to finish. Very impressive.