+Kay Hill's high school marching band does a week of "band camp" (practice and drills 8am-3pm) in June a week or two after school ends, and then again in August for the two weeks before school starts.
The final afternoon of the June session, they perform for any parents who can make it what they've learned of their street marching music and their field show for the next year. Here's Kay during that performance.
She'll be doing sectionals once a week during the summer, but that should be a lot less intense a going-on.

