and that the company just want to make sure no-one's enjoying themselves on work time?
I work for a large multi-national and we've been sent guidelines about how to keep safe this Christmas.
It includes things like making sure decs aren't in front of heaters and not driving after a drink.(no we're not children, but that's another thing!)
Also that it is much safer to put decorations up after everyone's gone home, so that people aren't in the way.
Mistletoe also banned (even at parties) but that might be for the best 
FFS!