Tales & Trails of a Traveling Wiseguy

My analysis of that situation is that as long as people are properly spaced out, wearing masks, and cleaning hands after touching shared surfaces, it's relatively safe. The choice between (a) two rooms of 20 people or (b) three rooms with 14 each seems fairly meaningless unless the spacing in A is too tight. Otherwise the incremental extra space in B provides scant value.

Far-and-away the biggest risk, though, is one not mentioned so far. How likely is it that anyone in the group is sick with Covid? You can't tell with a high degree of certainty that anyone is sick short of administering tests and isolating everyone until results are available. Generally speaking, that's infeasible. But you can gauge the risk by assessing habits: Has everyone taken reasonable precautions against infection in their daily lives the past 2 weeks? I would rather sit 2 hours in a room with 20 people who enter enclosed spaces only for essentials and always wear masks when they must be in them, than sit in the same room with just 2 people who routinely visit restaurants, bars, or friends' houses, taking off their masks to eat & drink & talk.