I did like China's gradual school reopening. Where first they opened high schools and middle schools only to the senior class in each. So that they could divide classes into smaller groups (in Shanghai classes are usually 45-50 kids per room, the same size as an American classroom -- so roughly double or more than the student density found in the US). After I think three weeks of such trial -- long enough to see if infections occurred -- they brought in other years. So the abbreviated school year was finished.
I'm not sure if that is a good model for the US, but could be tried in some areas where the transmissions are still occurring and the case for reopening is shaky. Localities where reopening schools is an iffy or borderline call, might initially try bringing in just one class year, dividing them into half-classes to allow for desk spacing, and if things go okay after a couple weeks, then adding other years later.
These are unusual times, and such a staggered schedule might help, as it would reduce risks, and also let schools get started with their new virus protocols with a reduced student population (1/3 to 1/4 normal).