Organise a costume parade with your neighbours or close friends — one that doesn't involve congregating or touching! Dress the kids up and hop in the car, following a predetermined map of houses of neighbours or friends, so that everyone can see each other's costumes. Or, if you have a smaller group, you could have all of the kids mask up and stand in a line down the sidewalk or along a big yard, then one family at a time can walk around from a distance, looking at everyone's costumes.