I put myself on the Tarrant County (Fort Worth Texas) health department vaccine list on March 3rd. Got an email on the 8th saying I could get the vaccine on March 11 between 4-5pm at stadium in Arlington. I was impressed by how fast that happened because I'm 70 but have no other qualifications for getting a fast appointment.
There were a ton of people there, but it was very orderly. The line was very long, but it was constantly moving at a casual walking speed (about 1 mph). The vaccination process, including being in line, took 20-30 minutes followed by 15 minutes sitting in an observation area.
This site was being run by FEMA using local fire department personnel and national guard troops to do the actual work. Everyone was very efficient, polite, and professional.
I barely felt the shot, and 20 hours later my only side effects have been a slight fever (less than 1 degree) a little bit of soreness in the arm where it was administered, and I slept a couple hours longer than normal last night and slept more soundly than normal. So far so good. I'm keeping my fingers crossed about the second dose.
Random observations:
They put the shot in your upper arm right next to the shoulder, not the bicep, so wear a muscle shirt, or a loose fitting short sleeve shirt that will easily pull up over your shoulder, or something similar that will easily expose your entire shoulder.
There was no "walk this way" signage in the parking lot, but there was a steady enough flow of people streaming out of the building to indicate where the path from parking to building entrance was.
As you enter the parking lot they ask to see a copy of the appointment confirmation email you received as proof you have an appointment and they give you a ticket which will let you enter the building. Inside the building they take that ticket and give you a card with a QR code you're supposed to scan with your phone to do the check-jn process. If you have a dinosaur phone, like I do, you tell the next worker you encounter that you don't have a smart phone, and that person will pass you through a fence into an area where people with laptops do the check-in process for you and pass you directly to the vaccination area.