Three weeks into summer, you start to notice things. The kid who has eight school friends suddenly does not have anyone to text. The one who is great at recess looks lost at the neighborhood pool. The bubbly one comes home from a playdate quiet, and you can tell something happened but you cannot get it out of them. This is the part of summer no one warns you about. School ends, and so does a lot of the structure that holds your kid’s friendships together. Recess. Lunch tables