From the CMS Bands web site:

For 2 weeks beginning July 9, the Spokane Thunder will be rehearsing all day long at CMS. Please feel free to stop by and check them out. See what they do in rehearsals to become so good. CMS grad Corey King is playing in the drum line.

On July 27, the Santa Clara Vanguard Cadets will be staying and rehearsing at CMS, followed by the competition at Albi Stadium that evening.

I believe that should say "at Central Valley High School that evening". See the Spokane Thunder web page for details.