One of the more frustrating things has been coordinating summer activities. Some camps go by last grade level, some by next grade level, and some are by age. My daughter was mildly upset to find out that a camp she loved last year is now closed to her because she skipped through the last grade they accepted.
You could just lie about her grade. I mean, it's summer camp, right? Not a big deal. We lied about my DD's age by a few months so that she could meet the cutoff for attending camp with her grade-mates, and it worked out fine.
Alternatively, you could just call and explain the situation. I did that once with my DS, who wanted to stay one level down in soccer for one more session, even though he had just aged out of it. They said it was no problem.
