Make a ''pin the donkey'' with a food related picture (e.g. pin the bacteria to the fallen sandwich)
Do a hand washing contest.
We had a UV light up cream. After HACCP training we would pick a few people who would ''moisturize'' with the UV cream. And than wash your hands. Check with a UV light for residue.
Best handwasher wins a price.
Have a food bar in which food is served in (fake) non-hygienic ways.
E.g. small toilet bowls, of the floor, with people wearing fake-dirty smocks, brownie ''sausages'' in a tray of puffed grain cereal (cat litter box)
They will wouldn't want to eat from unclear places themselves, so don't work unclean in your job.
I also remember a myth buster episode in which they had a group dinner with one of them having a fake runny nose. The fake runny nose was some UV-light up liquid. And at the end of the dinner they would light up the room to see where it all got (spoiler: it got everywhere).
Edited by Marloes, 07 March 2022 - 03:43 PM.