In my country it is not allowed to ask employees if they are vaccinated and they certainly can not ask for proof if they are vaccinated either . This is bit strange because with travelling abroad and going to music theaters and festivals, it is allowed to do so.FWIW, my work started with no proof...they require proof now. I don't know how that works legally, but I guess the legal dept thinks the way they're doing it will be fine.
To enter festivals, night clubs and theaters they need to ask for a non-covid proof before entering. This can be a recent negative test result or a completed vaccination. We have a registration system and a app that’s showing a QR- code if you are safe. This started last week. But it doesn’t work flawless and a nightclub already had an outbreak.