America Sings and Sam the Eagle- 1974

So my aunt sent me these first two photos and until tonight I couldn't pinpoint the occasions in photo one. I didn't know if the young marching band in photo two was related. Then Disney History Institute posted a photo of the Opening Day Ceremonies of Disneyland's America Sings.  Then Foxxfur from Passport to Dreams Old and New tweeted the third photo posted above.

It appears my aunt was at Disneyland the day America Sings opened (or perhaps sometime that week?). Of course there's a chance the photo shoot took place some other time that summer, but I doubt it. I still don't know if the marching band had anything to do with the ceremony. It appears to be a High School band. 

Pictured in photo three are Sam the Eagle, Jazz Musician Count Basie, Disneyland 1974 Ambassador Carol DeKeyser, and Mickey Mouse.