The risk of contracting COVID-19 is really common sense.
Other than knowns like family, we must assume all others may be infected!
KNOWNS: Close friends and family. We know if the are ill or not. Kids in school becomes a wild card.
DISTANCE: At an absolute minimum six feet of separation and much more in a confined airspace. Hear that Airline Companies?
TIME: Chance of virus exposure increases with the contact time, like 60 second photo shoot or a six hour flight.
DENSITY: The more people in a confined area greatly increases the chance of exposure.
There is no such thing as risk free, just as high risk is obvious.