Short answers, pulled from the story.
Chas Newby was a British musician who temporarily filled the bassist position for the band after Stuart Sutcliffe left. He played four specific dates in December 1960 before Paul McCartney took over the duties permanently.
Chas Newby performed his final gig at the Casbah Club on the 31st of December 1960. This date marked the end of his brief tenure as their temporary bassist during the holiday break.
Charles Newby taught mathematics at Droitwich Spa High School following his departure from professional performance. He later lived in Alcester where he joined a charity group called the Racketts to stay connected to community music events.
John Lennon invited Chas Newby to travel to West Germany for the second trip but Newby declined because he chose to return to his university studies instead. He prioritized his education over joining the band on tour.
In 2016, Chas Newby stepped forward to perform as part of The Quarrymen which served as the direct precursor to the Beatles before they changed their name. This event brought attention back to the early history of Liverpool rock music.