You can do the math, take the GA Tech prevalence data and combine it with the false negative rate (has covid, tests negative). If you want to go further, consi

You can do the math, take the GA Tech prevalence data and combine it with the false negative rate (has covid, tests negative). If you want to go further, consider the time you will spend together in an indoor environment mask-less. I think there are some estimates of indoor transmission probabilities per time of exposure to a positive case. Bear in mind the average 5-8 day incubation period so even if you test the day before you are still almost a week behind in exposures. https://www.statnews.com/2020/08/20/covid-19-test-accuracy-supplement-the-math-of-bayes-theorem/ https://www.statnews.com/2020/08/20/covid-19-test-accuracy-s...