This is true. In the state where I worked, Massachusetts, we had strict protocols in the public schools that kept cases low, and in the district where I worked we had no in building spread. Sports are harder, and the one sport that had an issue was hockey, which may have been in part because masked were required nearly all the time during high school sports in Massachusetts except for narrow exceptions (swimmers/divers while in the pool for obvious reasons and X-country could say pull the mask down if more than 6 feet from other runners.) Obviously, that’s not the same as an event where everyone lives there, but I would think committing to proper masking, efforts at more distancing, and experimenting with opening windows and air purifiers would be a decent start.