We certainly do not want to create any barriers to your staff getting vaccinated, so yes, they can attend without an appointment.
However, we do need to collect a few extra details from your staff to enable us to upload their vaccination record to the Australian Immunisation Register (AIR) and this is best done prior to the clinic so we do encourage pre-booking.
If, on the other hand, your staff attend without making an appointment, we simply ask that you remind them to bring their phone and Medicare card to the clinic so they can register before seeing the nurse.