@jessmahler@wandering.shop also perhaps interesting perspective from a fellow board member (a hackerspace in my case), what we settled on now wrt covid precations is watching a 7 day average of the hospital admissions, if it's below 50 we don't mandate masks, when it goes above 75 we do again (for some hysteresis). Maybe not perfect but the country dropped *any* mask stuff many months ago so glad we're at least still doing something..
oh and we improved the ventilation a lot, using various co2 meters as proxy variables