I'm sitting here twiddling my thumbs (while daydreaming about a vacation
) because I had need of a tetanus shot unexpectedly the other night and they advised waiting 21 days before getting my next Covid vaccine. Not that I'd be rushing right out anyway; I took AZ back in mid-April (as did almost 200,000 Albertans) and the recommended interval after the first is 12 weeks for full immunity. But with no supply of AZ for 2nd doses, what to do next is a bit of a sticky wicket. Anyone wanting to mix-and-match is eligible after 8 weeks.
Here, no. Everyone is responsible for tracking their eligibility for second doses and making their own arrangements when the time comes. All forms of media regularly broadcast reminders and wherever you got your shot (there are many different sources - mass vaccination centres, pharmacies, doctor's offices, pop-up clinics, mobile clinics at workplaces and so forth) theoretically will send a text/robo-call when your eligibility date arrives.