Bicentennial
LAPL
Caption: July 4, 1976 "Thousands line the curbs along Wilshire Boulevard, here looking west from Ardmore, as the Big Red Trolley Car, now operating on giant-size tires instead of rails, proceeds westward with members of the California Boy's Choir and city officials inside."
Apparently in 1976, Burbank had their fire hydrants all decorated in a Bicentennial motif...
Two examples, of 39 total, that I think are the best; most of them are kinda bizarre, IMO:
Judge the others for yourself at this LAPL
LINK.