was he part of any show for bangladesh?
Yes, the charity event, The  Concert for Bangladesh.
George Harrison
Harrison responded to a request from Ravi Shankar by organising a charity event, the Concert for Bangladesh, which took place on 1 August 1971. 
what is referred as wonderwall music? Its a solo album and a soundtrack to a film. whose album? George Harrison. and in which film it was used? "Wonderwall". when was the album released? November 1968. in which band did the above person work during early years? The Beatles. what was his role in this band? Guitarist.
wiki:7749818
George Harrison [SEP] The Concert for Bangladesh: 1971
Harrison responded to a request from Ravi Shankar by organising a charity event, the Concert for Bangladesh, which took place on 1 August 1971. The event drew over 40,000 people to two shows in New York's Madison Square Garden. The goal of the event was to raise money to aid starving refugees during the Bangladesh Liberation War. Shankar opened the show, which featured popular musicians such as Dylan, Clapton, Leon Russell, Badfinger, Preston and Starr. A triple album, "The Concert for Bangladesh", was released by Apple in December, followed by a concert film in 1972. Credited to "George Harrison and Friends", the album topped the UK chart and peaked at number 2 in the US, and went on to win the Grammy Award for Album of the Year.