Actor Amitabh Bachchan participated in a peace concert that took place on Wednesday. And, Big B made sure to invite his extended online family too. “Free Passes for the Global Sounds of Peace here: http://www.facebook.com/AmitabhBachchan/app_280175098778673... Just click Like, take out a printout and show at Gate No.1 of Andheri Sports Complex and you can go inside free,” Big B posted on his Facebook page.