Impossible to enforce at most fields. Parents will drop of their DD/DS and then the other parent park somewhere else. Unless the ref is going to count then card teams until they comply or forfeit, parents will just space out around the parking lot or at another field. For those fields with one entry/exit, a little easier to enforce, but our club, that isn't the case.
Refs have been told we're not responsible for enforcing social distancing, masks and the like.
Which is too bad, because then I could've thrown out an entire team's parents before a game and saved a lot of trouble down the road.
I guess it is understandable, though, since some people act like lunatics when asked to wear a mask. I saw a crazy woman in CVS threated to kill the person working the counter when he asked her to put on a mask. On the other hand, refs probably deal with insane people even in normal times.