I strongly recommend not to walk in for the shot. The handling of this vaccination is a disaster. I heard that Grand Hyatt has walk ins. I go there and there are teams of people standing outside in the heat waiting for their turn like it's a school field trip with no social distancing or queue poles. The person in charge is just getting frustrated with all the questions and rudely asks you to go away. Ultimately, I asked one of the "guards" standing outside, and they said only appointments. It's better to just call and take an appointment rather than risking it and trying to get lucky. Its really not worth all the hassle.

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Only walk in if someone you know has proof that they went there and also ask them the time. This is only if you cannot get an appointment first.