Disclaimer: this is not a complaint. I am thrilled that my children's schools are doing what they can to start the year off slowly and safely.
The first week of school is going to be massively confusing, especially for people who have left the house at regular times, or not at all, for the last six months. Return to school activities are to be staggered for small group interactions as they get things off the ground. This is awesome.
One child's school is working off an alphabetical-by-surname schedule. One is working off a grade-level schedule. One school is all or nothing - the kids come in for a full day or not at all. The other school will have all children present on Day 1, just at different times.
It's like a logic game ... so it's good that we like logic games.