When it comes to the Beatles’ remarkable story, there is no shortage of highwater marks. Their history is pocked with career-making highlights: the band’s bravura February 9, 1964, appearance on “The Ed Sullivan Show” that netted some 73 million viewers. The group’s June 25, 1967, performance of “All You Need Is Love” on the “Our World” satellite broadcast that was relayed across the globe with an estimated viewership of some half a billion people. Or somewhat more quaintly but no less impactful: the Beatles’ final public performance as a working rock ‘n’ roll band on the rooftop of their office building on January 30, 1969, scant months ahead of the release of their “Abbey Road” swan song.

Perhaps no event looms larger than the Beatles’ August 15, 1965, performance at Shea Stadium in fro

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