Director John Singleton, who died on April 28, will get one last official send-off from his fans, friends and family at his graduation college.According to TMZ, the late famed director will have a big memorial celebration at USC on May 21 from 11-2 PM. The complete details are yet to be known, but things are still being worked out regarding celebrities who might turn up to speak or perform during the occasion. There are several prominent personalities who have already RSVP'd that they'll be there.A private funeral and celebration of life were held last week for John's closest friends and loved ones like Ludacris, Ice Cube, Tyrese, Maxine Waters, Ving Rhames and Jim Brown but, the USC event will be much larger, as reported by TMZ.The website was told that it's not going to be a total free-for-all for the public and it won't be super small like the funeral, but a few thousand invites will go out.The memorial will showcase Singleton's past work and pay homage to his life and ...