In 1971, George Harrison put on the Concert for Bangladesh, and Ringo Starr was the only former Beatle to perform. Both John Lennon and Paul McCartney worried about the optics of performing with former bandmates and declined to join the event. Starr admitted that Harrison also had these concerns; because of this, he said Harrison didn’t expressly invite him. Regardless, Starr showed up to perform.

The Concert for Bangladesh was one of the first concerts of its kind
In 1971, Harrison and Ravi Shankar hosted two benefit concerts at Madison Square Garden to fund relief efforts for refugees from the Bangladesh Liberation War. He welcomed a number of musicians, including Eric Clapton, Bob Dylan, Leon Russell, and Billy Preston.
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