I think where I am vaccination rates are upwards of 90%, so I would think essentially everyone getting it is vaccinated or has had a previous variant. Or both.

Multiple sites I've tried for making a booster appointment make you choose a location and a day before they tell you "nope, no appointments available". That seems insane, but it also seems to be a pattern and I'm wondering if there are weird incentives that caused them to design it that way instead of telling you what is available.