Can you include the option to change your vote? I'm not scheduled right now, but I hope to schedule my first (likely Pfizer) shot soon.
Unfortunately, I usually remember to include that option, but I forgot to this time.
I don't think it is possible to edit the poll to do that (I just tried), but if someone has an idea on how to do that, I will try again.
The only other option would be to do another poll sometime in the future.
I voted, scheduled to, but as of now I have gotten the first shot, and I can not change my vote either.